From fc42fe56a57eace2dbdb31574c2e161f0eacf839 Mon Sep 17 00:00:00 2001
From: Ludovic Court`es
Date: Wed, 15 Jun 2005 13:00:39 +0000
Subject: Initial import of Skribe 1.2d.

Initial import of Skribe 1.2d.


git-archimport-id: lcourtes@laas.fr--2004-libre/skribilo--devel--1.2--base-0
---
 skr/html.skr | 2251 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 2251 insertions(+)
 create mode 100644 skr/html.skr

(limited to 'skr/html.skr')

diff --git a/skr/html.skr b/skr/html.skr
new file mode 100644
index 0000000..ebac5f2
--- /dev/null
+++ b/skr/html.skr
@@ -0,0 +1,2251 @@
+;*=====================================================================*/
+;*    serrano/prgm/project/skribe/skr/html.skr                         */
+;*    -------------------------------------------------------------    */
+;*    Author      :  Manuel Serrano                                    */
+;*    Creation    :  Sat Jul 26 12:28:57 2003                          */
+;*    Last change :  Thu Jun  2 10:57:42 2005 (serrano)                */
+;*    Copyright   :  2003-05 Manuel Serrano                            */
+;*    -------------------------------------------------------------    */
+;*    HTML Skribe engine                                               */
+;*    -------------------------------------------------------------    */
+;*    Implementation:                                                  */
+;*       common: @path ../src/common/api.src@                          */
+;*       bigloo: @path ../src/bigloo/api.bgl@                          */
+;*    -------------------------------------------------------------    */
+;*    doc:                                                             */
+;*       @ref ../../doc/user/htmle.skb:ref@                            */
+;*=====================================================================*/
+
+;*---------------------------------------------------------------------*/
+;*    html-engine ...                                                  */
+;*---------------------------------------------------------------------*/
+(define html-engine
+   ;; setup the html engine
+   (default-engine-set!
+      (make-engine 'html
+	 :version 1.0
+	 :format "html"
+	 :delegate (find-engine 'base)
+	 :filter (make-string-replace '((#\< "&lt;")
+					(#\> "&gt;")
+					(#\& "&amp;")
+					(#\" "&quot;")
+					(#\@ "&#x40;")))
+	 :custom `(;; the icon associated with the URL
+		   (favicon #f)
+		   ;; charset used
+		   (charset "ISO-8859-1")
+		   ;; enable/disable Javascript
+		   (javascript #f)
+		   ;; user html head
+		   (head #f)
+		   ;; user CSS
+		   (css ())
+		   ;; user inlined CSS
+		   (inline-css ())
+		   ;; user JS
+		   (js ())
+		   ;; emit-sui
+		   (emit-sui #f)
+		   ;; the body
+		   (background "#ffffff")
+		   (foreground #f)
+		   ;; the margins
+		   (margin-padding 3)
+		   (left-margin #f)
+		   (chapter-left-margin #f)
+		   (section-left-margin #f)
+		   (left-margin-font #f)
+		   (left-margin-size 17.)
+		   (left-margin-background "#dedeff")
+		   (left-margin-foreground #f)
+		   (right-margin #f)
+		   (chapter-right-margin #f)
+		   (section-right-margin #f)
+		   (right-margin-font #f)
+		   (right-margin-size 17.)
+		   (right-margin-background "#dedeff")
+		   (right-margin-foreground #f)
+		   ;; author configuration
+		   (author-font #f)
+		   ;; title configuration
+		   (title-font #f)
+		   (title-background "#8381de")
+		   (title-foreground #f)
+		   (file-title-separator " -- ")
+		   ;; index configuration
+		   (index-header-font-size +2.)
+		   ;; chapter configuration
+		   (chapter-number->string number->string)
+		   (chapter-file #f)
+		   ;; section configuration
+		   (section-title-start "<h3>")
+		   (section-title-stop "</h3>")
+		   (section-title-background "#dedeff")
+		   (section-title-foreground "black")
+		   (section-title-number-separator " ")
+		   (section-number->string number->string)
+		   (section-file #f)
+		   ;; subsection configuration
+		   (subsection-title-start "<h3>")
+		   (subsection-title-stop "</h3>")
+		   (subsection-title-background "#ffffff")
+		   (subsection-title-foreground "#8381de")
+		   (subsection-title-number-separator " ")
+		   (subsection-number->string number->string)
+		   (subsection-file #f)
+		   ;; subsubsection configuration
+		   (subsubsection-title-start "<h4>")
+		   (subsubsection-title-stop "</h4>")
+		   (subsubsection-title-background #f)
+		   (subsubsection-title-foreground "#8381de")
+		   (subsubsection-title-number-separator " ")
+		   (subsubsection-number->string number->string)
+		   (subsubsection-file #f)
+		   ;; source fontification
+		   (source-color #t)
+		   (source-comment-color "#ffa600")
+		   (source-error-color "red")
+		   (source-define-color "#6959cf")
+		   (source-module-color "#1919af")
+		   (source-markup-color "#1919af")
+		   (source-thread-color "#ad4386")
+		   (source-string-color "red")
+		   (source-bracket-color "red")
+		   (source-type-color "#00cf00")
+		   ;; image
+		   (image-format ("png" "gif" "jpg" "jpeg")))
+	 :symbol-table '(("iexcl" "&#161;")
+			 ("cent" "&#162;")
+			 ("pound" "&#163;")
+			 ("currency" "&#164;")
+			 ("yen" "&#165;")
+			 ("section" "&#167;")
+			 ("mul" "&#168;")
+			 ("copyright" "&#169;")
+			 ("female" "&#170;")
+			 ("lguillemet" "&#171;")
+			 ("not" "&#172;")
+			 ("registered" "&#174;")
+			 ("degree" "&#176;")
+			 ("plusminus" "&#177;")
+			 ("micro" "&#181;")
+			 ("paragraph" "&#182;")
+			 ("middot" "&#183;")
+			 ("male" "&#184;")
+			 ("rguillemet" "&#187;")
+			 ("1/4" "&#188;")
+			 ("1/2" "&#189;")
+			 ("3/4" "&#190;")
+			 ("iquestion" "&#191;")
+			 ("Agrave" "&#192;")
+			 ("Aacute" "&#193;")
+			 ("Acircumflex" "&#194;")
+			 ("Atilde" "&#195;")
+			 ("Amul" "&#196;")
+			 ("Aring" "&#197;")
+			 ("AEligature" "&#198;")
+			 ("Oeligature" "&#338;")
+			 ("Ccedilla" "&#199;")
+			 ("Egrave" "&#200;")
+			 ("Eacute" "&#201;")
+			 ("Ecircumflex" "&#202;")
+			 ("Euml" "&#203;")
+			 ("Igrave" "&#204;")
+			 ("Iacute" "&#205;")
+			 ("Icircumflex" "&#206;")
+			 ("Iuml" "&#207;")
+			 ("ETH" "&#208;")
+			 ("Ntilde" "&#209;")
+			 ("Ograve" "&#210;")
+			 ("Oacute" "&#211;")
+			 ("Ocurcumflex" "&#212;")
+			 ("Otilde" "&#213;")
+			 ("Ouml" "&#214;")
+			 ("times" "&#215;")
+			 ("Oslash" "&#216;")
+			 ("Ugrave" "&#217;")
+			 ("Uacute" "&#218;")
+			 ("Ucircumflex" "&#219;")
+			 ("Uuml" "&#220;")
+			 ("Yacute" "&#221;")
+			 ("THORN" "&#222;")
+			 ("szlig" "&#223;")
+			 ("agrave" "&#224;")
+			 ("aacute" "&#225;")
+			 ("acircumflex" "&#226;")
+			 ("atilde" "&#227;")
+			 ("amul" "&#228;")
+			 ("aring" "&#229;")
+			 ("aeligature" "&#230;")
+			 ("oeligature" "&#339;")
+			 ("ccedilla" "&#231;")
+			 ("egrave" "&#232;")
+			 ("eacute" "&#233;")
+			 ("ecircumflex" "&#234;")
+			 ("euml" "&#235;")
+			 ("igrave" "&#236;")
+			 ("iacute" "&#237;")
+			 ("icircumflex" "&#238;")
+			 ("iuml" "&#239;")
+			 ("eth" "&#240;")
+			 ("ntilde" "&#241;")
+			 ("ograve" "&#242;")
+			 ("oacute" "&#243;")
+			 ("ocurcumflex" "&#244;")
+			 ("otilde" "&#245;")
+			 ("ouml" "&#246;")
+			 ("divide" "&#247;")
+			 ("oslash" "&#248;")
+			 ("ugrave" "&#249;")
+			 ("uacute" "&#250;")
+			 ("ucircumflex" "&#251;")
+			 ("uuml" "&#252;")
+			 ("yacute" "&#253;")
+			 ("thorn" "&#254;")
+			 ("ymul" "&#255;")
+			 ;; Greek 
+			 ("Alpha" "&#913;") 
+			 ("Beta" "&#914;")
+			 ("Gamma" "&#915;")
+			 ("Delta" "&#916;")
+			 ("Epsilon" "&#917;")
+			 ("Zeta" "&#918;")
+			 ("Eta" "&#919;")
+			 ("Theta" "&#920;")
+			 ("Iota" "&#921;")
+			 ("Kappa" "&#922;")
+			 ("Lambda" "&#923;")
+			 ("Mu" "&#924;")
+			 ("Nu" "&#925;")
+			 ("Xi" "&#926;")
+			 ("Omicron" "&#927;")
+			 ("Pi" "&#928;")
+			 ("Rho" "&#929;")
+			 ("Sigma" "&#931;")
+			 ("Tau" "&#932;")
+			 ("Upsilon" "&#933;")
+			 ("Phi" "&#934;")
+			 ("Chi" "&#935;")
+			 ("Psi" "&#936;")
+			 ("Omega" "&#937;")
+			 ("alpha" "&#945;")
+			 ("beta" "&#946;")
+			 ("gamma" "&#947;")
+			 ("delta" "&#948;")
+			 ("epsilon" "&#949;")
+			 ("zeta" "&#950;")
+			 ("eta" "&#951;")
+			 ("theta" "&#952;")
+			 ("iota" "&#953;")
+			 ("kappa" "&#954;")
+			 ("lambda" "&#955;")
+			 ("mu" "&#956;")
+			 ("nu" "&#957;")
+			 ("xi" "&#958;")
+			 ("omicron" "&#959;")
+			 ("pi" "&#960;")
+			 ("rho" "&#961;")
+			 ("sigmaf" "&#962;")
+			 ("sigma" "&#963;")
+			 ("tau" "&#964;")
+			 ("upsilon" "&#965;")
+			 ("phi" "&#966;")
+			 ("chi" "&#967;")
+			 ("psi" "&#968;")
+			 ("omega" "&#969;")
+			 ("thetasym" "&#977;")
+			 ("piv" "&#982;")
+			 ;; punctuation
+			 ("bullet" "&#8226;")
+			 ("ellipsis" "&#8230;")
+			 ("weierp" "&#8472;")
+			 ("image" "&#8465;")
+			 ("real" "&#8476;")
+			 ("tm" "&#8482;")
+			 ("alef" "&#8501;")
+			 ("<-" "&#8592;")
+			 ("<--" "&#8592;")
+			 ("uparrow" "&#8593;")
+			 ("->" "&#8594;")
+			 ("-->" "&#8594;")
+			 ("downarrow" "&#8595;")
+			 ("<->" "&#8596;")
+			 ("<-->" "&#8596;")
+			 ("<+" "&#8629;")
+			 ("<=" "&#8656;")
+			 ("<==" "&#8656;")
+			 ("Uparrow" "&#8657;")
+			 ("=>" "&#8658;")
+			 ("==>" "&#8658;")
+			 ("Downarrow" "&#8659;")
+			 ("<=>" "&#8660;")
+			 ("<==>" "&#8660;")
+			 ;; Mathematical operators 
+			 ("forall" "&#8704;")
+			 ("partial" "&#8706;")
+			 ("exists" "&#8707;")
+			 ("emptyset" "&#8709;")
+			 ("infinity" "&#8734;")
+			 ("nabla" "&#8711;")
+			 ("in" "&#8712;")
+			 ("notin" "&#8713;")
+			 ("ni" "&#8715;")
+			 ("prod" "&#8719;")
+			 ("sum" "&#8721;")
+			 ("asterisk" "&#8727;")
+			 ("sqrt" "&#8730;")
+			 ("propto" "&#8733;")
+			 ("angle" "&#8736;")
+			 ("and" "&#8743;")
+			 ("or" "&#8744;")
+			 ("cap" "&#8745;")
+			 ("cup" "&#8746;")
+			 ("integral" "&#8747;")
+			 ("therefore" "&#8756;")
+			 ("models" "|=")
+			 ("vdash" "|-")
+			 ("dashv" "-|")
+			 ("sim" "&#8764;")
+			 ("cong" "&#8773;")
+			 ("approx" "&#8776;")
+			 ("neq" "&#8800;")
+			 ("equiv" "&#8801;")
+			 ("le" "&#8804;")
+			 ("ge" "&#8805;")
+			 ("subset" "&#8834;")
+			 ("supset" "&#8835;")
+			 ("nsupset" "&#8835;")
+			 ("subseteq" "&#8838;")
+			 ("supseteq" "&#8839;")
+			 ("oplus" "&#8853;")
+			 ("otimes" "&#8855;")
+			 ("perp" "&#8869;")
+			 ("mid" "|")
+			 ("lceil" "&#8968;")
+			 ("rceil" "&#8969;")
+			 ("lfloor" "&#8970;")
+			 ("rfloor" "&#8971;")
+			 ("langle" "&#9001;")
+			 ("rangle" "&#9002;")
+			 ;; Misc
+			 ("loz" "&#9674;") 
+			 ("spades" "&#9824;")
+			 ("clubs" "&#9827;")
+			 ("hearts" "&#9829;")
+			 ("diams" "&#9830;")
+			 ("euro" "&#8464;")
+			 ;; LaTeX 
+			 ("dag" "dag")
+			 ("ddag" "ddag")
+			 ("circ" "o")
+			 ("top" "T")
+			 ("bottom" "&#8869;")
+			 ("lhd" "<")
+			 ("rhd" ">")
+			 ("parallel" "||")))))
+
+;*---------------------------------------------------------------------*/
+;*    html-title-engine ...                                            */
+;*---------------------------------------------------------------------*/
+(define html-title-engine
+   (copy-engine 'html-title base-engine
+      :filter (make-string-replace '((#\< "&lt;")
+				     (#\> "&gt;")
+				     (#\& "&amp;")
+				     (#\" "&quot;")))))
+
+;*---------------------------------------------------------------------*/
+;*    html-browser-title ...                                           */
+;*---------------------------------------------------------------------*/
+(define (html-browser-title n)
+   (and (markup? n)
+	(or (markup-option n :html-title)
+	    (if (document? n)
+		(markup-option n :title)
+		(html-browser-title (ast-parent n))))))
+
+;*---------------------------------------------------------------------*/
+;*    html-file ...                                                    */
+;*---------------------------------------------------------------------*/
+(define html-file
+   (let ((table '())
+	 (filename (gensym)))
+      (define (get-file-name base suf)
+	 (let* ((c (assoc base table))
+		(n (if (pair? c)
+		       (let ((n (+ 1 (cdr c))))
+			  (set-cdr! c n)
+			  n)
+		       (begin
+			  (set! table (cons (cons base 1) table))
+			  1))))
+	    (format "~a-~a.~a" base n suf)))
+      (lambda (node e)
+	 (let ((f (markup-option node filename))
+	       (file (markup-option node :file)))
+	    (cond
+	       ((string? f)
+		f)
+	       ((string? file)
+		file)
+	       ((or file 
+		    (and (is-markup? node 'chapter)
+			 (engine-custom e 'chapter-file))
+		    (and (is-markup? node 'section)
+			 (engine-custom e 'section-file))
+		    (and (is-markup? node 'subsection)
+			 (engine-custom e 'subsection-file))
+		    (and (is-markup? node 'subsubsection)
+			 (engine-custom e 'subsubsection-file)))
+		(let* ((b (or (and (string? *skribe-dest*)
+				   (prefix *skribe-dest*))
+			      ""))
+		       (s (or (and (string? *skribe-dest*)
+				   (suffix *skribe-dest*))
+			      "html"))
+		       (nm (get-file-name b s)))
+		   (markup-option-add! node filename nm)
+		   nm))
+	       ((document? node)
+		*skribe-dest*)
+	       (else
+		(let ((p (ast-parent node)))
+		   (if (container? p)
+		       (let ((file (html-file p e)))
+			  (if (string? file)
+			      (begin
+				 (markup-option-add! node filename file)
+				 file)
+			      #f))
+		       #f))))))))
+
+;*---------------------------------------------------------------------*/
+;*    html-container-number ...                                        */
+;*    -------------------------------------------------------------    */
+;*    Returns a string representing the container number               */
+;*---------------------------------------------------------------------*/
+(define (html-container-number c e)
+   (define (html-number n proc)
+      (cond
+	 ((string? n)
+	  n)
+	 ((number? n)
+	  (if (procedure? proc) 
+	      (proc n)
+	      (number->string n)))
+	 (else
+	  "")))
+   (define (html-chapter-number c)
+      (html-number (markup-option c :number) 
+		   (engine-custom e 'chapter-number->string)))
+   (define (html-section-number c)
+      (let ((p (ast-parent c))
+	    (s (html-number (markup-option c :number) 
+			    (engine-custom e 'section-number->string))))
+	 (cond
+	    ((is-markup? p 'chapter)
+	     (string-append (html-chapter-number p) "." s))
+	    (else
+	     (string-append s)))))
+   (define (html-subsection-number c)
+      (let ((p (ast-parent c))
+	    (s (html-number (markup-option c :number) 
+			    (engine-custom e 'subsection-number->string))))
+	 (cond
+	    ((is-markup? p 'section)
+	     (string-append (html-section-number p) "." s))
+	    (else
+	     (string-append "." s)))))
+   (define (html-subsubsection-number c)
+      (let ((p (ast-parent c))
+	    (s (html-number (markup-option c :number) 
+			    (engine-custom e 'subsubsection-number->string))))
+	 (cond
+	    ((is-markup? p 'subsection)
+	     (string-append (html-subsection-number p) "." s))
+	    (else
+	     (string-append ".." s)))))
+   (define (inner-html-container-number c)
+      (html-number (markup-option c :number) #f))
+   (let ((n (markup-option c :number)))
+      (if (not n)
+	  ""
+	  (case (markup-markup c)
+	     ((chapter)
+	      (html-chapter-number c))
+	     ((section)
+	      (html-section-number c))
+	     ((subsection)
+	      (html-subsection-number c))
+	     ((subsubsection)
+	      (html-subsubsection-number c))
+	     (else
+	      (if (container? c)
+		  (inner-html-container-number c)
+		  (skribe-error 'html-container-number
+				"Not a container"
+				(markup-markup c))))))))
+   
+;*---------------------------------------------------------------------*/
+;*    html-counter ...                                                 */
+;*---------------------------------------------------------------------*/
+(define (html-counter cnts)
+   (cond
+      ((not cnts)
+       "")
+      ((null? cnts)
+       "")
+      ((not (pair? cnts))
+       cnts)
+      ((null? (cdr cnts))
+       (format "~a." (car cnts)))
+      (else
+       (let loop ((cnts cnts))
+	  (if (null? (cdr cnts))
+	      (format "~a" (car cnts))
+	      (format "~a.~a" (car cnts) (loop (cdr cnts))))))))
+
+;*---------------------------------------------------------------------*/
+;*    html-width ...                                                   */
+;*---------------------------------------------------------------------*/
+(define (html-width width)
+   (cond
+      ((and (integer? width) (exact? width))
+       (format "~A" width))
+      ((real? width)
+       (format "~A%" (inexact->exact (round width))))
+      ((string? width)
+       width)
+      (else
+       (skribe-error 'html-width "bad width" width))))
+
+;*---------------------------------------------------------------------*/
+;*    html-class ...                                                   */
+;*---------------------------------------------------------------------*/
+(define (html-class m)
+   (if (markup? m)
+       (let ((c (markup-class m)))
+	  (if (or (string? c) (symbol? c) (number? c))
+	      (printf " class=\"~a\"" c)))))
+
+;*---------------------------------------------------------------------*/
+;*    html-markup-class ...                                            */
+;*---------------------------------------------------------------------*/
+(define (html-markup-class m)
+   (lambda (n e)
+      (printf "<~a" m)
+      (html-class n)
+      (display ">")))
+
+;*---------------------------------------------------------------------*/
+;*    html-color-spec? ...                                             */
+;*---------------------------------------------------------------------*/
+(define (html-color-spec? v)
+   (and v 
+	(not (unspecified? v))
+	(or (not (string? v)) (> (string-length v) 0))))
+			  
+;*---------------------------------------------------------------------*/
+;*    document ...                                                     */
+;*---------------------------------------------------------------------*/
+(markup-writer 'document
+   :options '(:title :author :ending :html-title :env)
+   :action (lambda (n e)
+	      (let* ((id (markup-ident n))
+		     (title (new markup
+			       (markup '&html-document-title)
+			       (parent n)
+			       (ident (string-append id "-title"))
+			       (class (markup-class n))
+			       (options `((author ,(markup-option n :author))))
+			       (body (markup-option n :title)))))
+		 (&html-generic-document n title e)))
+   :after (lambda (n e)
+	     (if (engine-custom e 'emit-sui)
+		 (document-sui n e))))
+
+;*---------------------------------------------------------------------*/
+;*    &html-html ...                                                   */
+;*---------------------------------------------------------------------*/
+(markup-writer '&html-html
+   :before "<!-- 95% W3C COMPLIANT, 95% CSS FREE, RAW HTML -->
+<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">
+<html>\n"
+   :after "</html>")
+
+;*---------------------------------------------------------------------*/
+;*    &html-head ...                                                   */
+;*---------------------------------------------------------------------*/
+(markup-writer '&html-head
+   :before (lambda (n e)
+	     (printf "<head>\n")
+	     (printf "<meta http-equiv=\"Content-Type\" content=\"text/html;")
+	     (printf "charset=~A\">\n" (engine-custom (find-engine 'html)
+						      'charset)))
+   :after "</head>\n\n")
+
+;*---------------------------------------------------------------------*/
+;*    &html-body ...                                                   */
+;*---------------------------------------------------------------------*/
+(markup-writer '&html-body 
+   :before (lambda (n e)
+	      (let ((bg (engine-custom e 'background)))
+		 (display "<body")
+		 (html-class n)
+		 (when (html-color-spec? bg) (printf " bgcolor=\"~a\"" bg))
+		 (display ">\n")))
+   :after "</body>\n")
+
+;*---------------------------------------------------------------------*/
+;*    &html-page ...                                                   */
+;*---------------------------------------------------------------------*/
+(markup-writer '&html-page
+   :action (lambda (n e)
+	      (define (html-margin m fn size bg fg cla)
+		 (printf "<td align=\"left\" valign=\"top\" class=\"~a\"" cla)
+		 (if size
+		     (printf " width=\"~a\"" (html-width size)))
+		 (if (html-color-spec? bg)
+		     (printf " bgcolor=\"~a\">" bg)
+		     (display ">"))
+		 (printf "<div class=\"~a\">\n" cla)
+		 (cond
+		    ((and (string? fg) (string? fn))
+		     (printf "<font color=\"~a\" \"~a\">" fg fn))
+		    ((string? fg)
+		     (printf "<font color=\"~a\">" fg))
+		    ((string? fn)
+		     (printf "<font \"~a\">" fn)))
+		 (if (procedure? m)
+		     (skribe-eval (m n e) e)
+		     (output m e))
+		 (if (or (string? fg) (string? fn))
+		     (display "</font>"))
+		 (display "</div></td>\n"))
+	      (let ((body (markup-body n))
+		    (lm (engine-custom e 'left-margin))
+		    (lmfn (engine-custom e 'left-margin-font))
+		    (lms (engine-custom e 'left-margin-size))
+		    (lmbg (engine-custom e 'left-margin-background))
+		    (lmfg (engine-custom e 'left-margin-foreground))
+		    (rm (engine-custom e 'right-margin))
+		    (rmfn (engine-custom e 'right-margin-font))
+		    (rms (engine-custom e 'right-margin-size))
+		    (rmbg (engine-custom e 'right-margin-background))
+		    (rmfg (engine-custom e 'right-margin-foreground)))
+		 (cond
+		    ((and lm rm)
+		     (let* ((ep (engine-custom e 'margin-padding))
+			    (ac (if (number? ep) ep 0)))
+			(printf "<table cellpadding=\"~a\" cellspacing=\"0\" width=\"100%\" class=\"skribe-margins\"><tr>\n" ac))
+		     (html-margin lm lmfn lms lmbg lmfg "skribe-left-margin")
+		     (html-margin body #f #f #f #f "skribe-body")
+		     (html-margin rm rmfn rms rmbg rmfg "skribe-right-margin")
+		     (display "</tr></table>"))
+		    (lm
+		     (let* ((ep (engine-custom e 'margin-padding))
+			    (ac (if (number? ep) ep 0)))
+			(printf "<table cellpadding=\"~a\" cellspacing=\"0\" width=\"100%\" class=\"skribe-margins\"><tr>\n" ac))
+		     (html-margin lm lmfn lms lmbg lmfg "skribe-left-margin")
+		     (html-margin body #f #f #f #f "skribe-body")
+		     (display "</tr></table>"))
+		    (rm
+		     (let* ((ep (engine-custom e 'margin-padding))
+			    (ac (if (number? ep) ep 0)))
+			(printf "<table cellpadding=\"~a\" cellspacing=\"0\" width=\"100%\" class=\"skribe-margins\"><tr>\n"))
+		     (html-margin body #f #f #f #f "skribe-body")
+		     (html-margin rm rmfn rms rmbg rmfg "skribe-right-margin")
+		     (display "</tr></table>"))
+		    (else
+		     (display "<div class=\"skribe-body\">\n")
+		     (output body e)
+		     (display "</div>\n"))))))
+
+;*---------------------------------------------------------------------*/
+;*    &html-generic-header ...                                         */
+;*---------------------------------------------------------------------*/
+(define (&html-generic-header n e)
+   (let* ((ic (engine-custom e 'favicon))
+	  (id (markup-ident n)))
+      (unless (string? id)
+	 (skribe-error '&html-generic-header 
+		       (format "Illegal identifier `~a'" id)
+		       n))
+      ;; title
+      (output (new markup
+		 (markup '&html-header-title)
+		 (parent n)
+		 (ident (string-append id "-title"))
+		 (class (markup-class n))
+		 (body (markup-body n)))
+	      e)
+      ;; favicon
+      (output (new markup
+		 (markup '&html-header-favicon)
+		 (parent n)
+		 (ident (string-append id "-favicon"))
+		 (body (cond
+			  ((string? ic)
+			   ic)
+			  ((procedure? ic)
+			   (ic d e)))))
+	      e)
+      ;; style
+      (output (new markup
+		 (markup '&html-header-style)
+		 (parent n)
+		 (ident (string-append id "-style"))
+		 (class (markup-class n)))
+	      e)
+      ;; css
+      (output (new markup
+		 (markup '&html-header-css)
+		 (parent n)
+		 (ident (string-append id "-css"))
+		 (body (let ((c (engine-custom e 'css)))
+			  (if (string? c)
+			      (list c) 
+			      c))))
+	      e)
+      ;; javascript
+      (output (new markup
+		 (markup '&html-header-javascript)
+		 (parent n)
+		 (ident (string-append id "-javascript")))
+	      e)))
+
+(markup-writer '&html-header-title
+   :before "<title>"
+   :action (lambda (n e)
+	      (output (markup-body n) html-title-engine))
+   :after "</title>\n")
+
+(markup-writer '&html-header-favicon
+   :action (lambda (n e)
+	      (let ((i (markup-body n)))
+		 (when i
+		    (printf " <link rel=\"shortcut icon\" href=~s>\n" i)))))
+
+(markup-writer '&html-header-css
+   :action (lambda (n e)
+	      (let ((css (markup-body n)))
+		 (when (pair? css)
+		    (for-each (lambda (css)
+				 (printf " <link href=~s rel=\"stylesheet\" type=\"text/css\">\n" css))
+			      css)))))
+	      
+(markup-writer '&html-header-style
+   :before " <style type=\"text/css\">\n  <!--\n"
+   :action (lambda (n e)
+	      (let ((hd (engine-custom e 'head))
+		    (icss (let ((ic (engine-custom e 'inline-css)))
+			     (if (string? ic)
+				 (list ic)
+				 ic))))
+		 (display "  pre { font-family: monospace }\n")
+		 (display "  tt { font-family: monospace }\n")
+		 (display "  code { font-family: monospace }\n")
+		 (display "  p.flushright { text-align: right }\n")
+		 (display "  p.flushleft { text-align: left }\n")
+		 (display "  span.sc { font-variant: small-caps }\n")
+		 (display "  span.sf { font-family: sans-serif }\n")
+		 (display "  span.skribetitle { font-family: sans-serif; font-weight: bolder; font-size: x-large; }\n")
+		 (when hd (display (format "  ~a\n" hd)))
+		 (when (pair? icss)
+		    (for-each (lambda (css)
+				 (let ((p (open-input-file css)))
+				    (if (not (input-port? p))
+					(skribe-error 
+					 'html-css
+					 "Can't open CSS file for input"
+					 css)
+					(begin
+					   (let loop ((l (read-line p)))
+					      (unless (eof-object? l)
+						 (display l)
+						 (newline)
+						 (loop (read-line p))))
+					   (close-input-port p)))))
+			      icss))))
+   :after "  -->\n </style>\n")
+	      
+(markup-writer '&html-header-javascript
+   :action (lambda (n e)
+	      (when (engine-custom e 'javascript)
+		 (display " <script language=\"JavaScript\" type=\"text/javascript\">\n")
+		 (display " <!--\n")
+		 (display "  function skribenospam( n, d, f ) {\n")
+		 (display "    nn=n.replace( / /g , \".\" );\n" )
+		 (display "    dd=d.replace( / /g , \".\" );\n" )
+		 (display "    document.write( \"<a href=\\\"mailto:\" + nn + \"@\" + dd + \"\\\">\" );\n")
+		 (display "    if( f ) {\n")
+		 (display "      document.write( \"<tt>\" + nn + \"@\" + dd + \"</\" + \"tt><\" + \"/a>\" );\n")
+		 (display "    }\n")
+		 (display "  }\n")
+		 (display " -->\n")
+		 (display " </script>\n"))
+	      (let* ((ejs (engine-custom e 'js))
+		     (js (cond
+			    ((string? ejs)
+			     (list ejs))
+			    ((list? ejs)
+			     ejs)
+			    (else
+			     '()))))
+		 (for-each (lambda (s)
+			      (printf "<script type=\"text/javascript\" src=\"~a\"></script>" s))
+			   js))))
+			      
+	      
+;*---------------------------------------------------------------------*/
+;*    &html-header ...                                                 */
+;*---------------------------------------------------------------------*/
+(markup-writer '&html-document-header :action &html-generic-header)
+(markup-writer '&html-chapter-header :action &html-generic-header)
+(markup-writer '&html-section-header :action &html-generic-header)
+(markup-writer '&html-subsection-header :action &html-generic-header)
+(markup-writer '&html-subsubsection-header :action &html-generic-header)
+
+;*---------------------------------------------------------------------*/
+;*    &html-ending ...                                                 */
+;*---------------------------------------------------------------------*/
+(markup-writer '&html-ending
+   :before "<div class=\"skribe-ending\">"
+   :action (lambda (n e)
+	      (let ((body (markup-body n)))
+		 (if body
+		     (output body #t)
+		     (skribe-eval [
+,(hrule) 
+,(p :class "ending" (font :size -1 [
+This ,(sc "Html") page has been produced by 
+,(ref :url (skribe-url) :text "Skribe").
+,(linebreak)
+Last update ,(it (date)).]))] e))))
+   :after "</div>\n")
+
+;*---------------------------------------------------------------------*/
+;*    &html-generic-title ...                                          */
+;*---------------------------------------------------------------------*/
+(define (&html-generic-title n e)
+   (let* ((title (markup-body n))
+	  (authors (markup-option n 'author))
+	  (tbg (engine-custom e 'title-background))
+	  (tfg (engine-custom e 'title-foreground))
+	  (tfont (engine-custom e 'title-font)))
+      (when title
+	 (display "<table width=\"100%\" class=\"skribetitle\" cellspacing=\"0\" cellpadding=\"0\"><tbody>\n<tr>")
+	 (if (html-color-spec? tbg)
+	     (printf "<td align=\"center\" bgcolor=\"~a\">" tbg)
+	     (display "<td align=\"center\">"))
+	 (if (string? tfg)
+	     (printf "<font color=\"~a\">" tfg))
+	 (when title
+	    (if (string? tfont)
+		(begin
+		   (printf "<font ~a><strong>" tfont)
+		   (output title e)
+		   (display "</strong></font>"))
+		(begin
+		   (printf "<div class=\"skribetitle\"><strong><big><big><big>")
+		   (output title e)
+		   (display "</big></big></big></strong></div>"))))
+	 (if (not authors)
+	     (display "\n")
+	     (html-title-authors authors e))
+	 (if (string? tfg)
+	     (display "</font>"))
+	 (display "</td></tr></tbody></table>\n"))))
+
+;*---------------------------------------------------------------------*/
+;*    &html-document-title ...                                         */
+;*---------------------------------------------------------------------*/
+(markup-writer '&html-document-title :action &html-generic-title)
+(markup-writer '&html-chapter-title :action &html-generic-title)
+(markup-writer '&html-section-title :action &html-generic-title)
+(markup-writer '&html-subsection-title :action &html-generic-title)
+(markup-writer '&html-subsubsection-title :action &html-generic-title)
+
+;*---------------------------------------------------------------------*/
+;*    &html-footnotes                                                  */
+;*---------------------------------------------------------------------*/
+(markup-writer '&html-footnotes
+   :before (lambda (n e)
+	      (let ((footnotes (markup-body n)))
+		 (when (pair? footnotes)
+		    (display "<div class=\"footnote\">")
+		    (display "<br><br>\n")
+		    (display "<hr width='20%' size='2' align='left'>\n"))))
+   :action (lambda (n e)
+	      (let ((footnotes (markup-body n)))
+		 (when (pair? footnotes)
+		    (let loop ((fns footnotes))
+		       (if (pair? fns)
+			   (let ((fn (car fns)))
+			      (printf "<a name=\"footnote-~a\">" 
+				      (string-canonicalize 
+				       (container-ident fn)))
+			      (printf "<sup><small>~a</small></sup></a>: "
+				      (markup-option fn :number))
+			      (output (markup-body fn) e)
+			      (display "\n<br>\n")
+			      (loop (cdr fns)))))
+		    (display "<div>")))))
+
+;*---------------------------------------------------------------------*/
+;*    html-title-authors ...                                           */
+;*---------------------------------------------------------------------*/
+(define (html-title-authors authors e)
+   (define (html-authorsN authors cols first)
+      (define (make-row authors . opt)
+	 (tr (map (lambda (v)
+		     (apply td :align 'center :valign 'top v opt))
+		  authors)))
+      (define (make-rows authors)
+	 (let loop ((authors authors)
+		    (rows '())
+		    (row '())
+		    (cnum 0))
+	    (cond
+	       ((null? authors)
+		(reverse! (cons (make-row (reverse! row)) rows)))
+	       ((= cnum cols)
+		(loop authors
+		      (cons (make-row (reverse! row)) rows)
+		      '()
+		      0))
+	       (else
+		(loop (cdr authors)
+		      rows
+		      (cons (car authors) row)
+		      (+ cnum 1))))))
+      (output (table :cellpadding 10
+		 (if first
+		     (cons (make-row (list (car authors)) :colspan cols)
+			   (make-rows (cdr authors)))
+		     (make-rows authors)))
+	      e))
+   (cond
+      ((pair? authors)
+       (display "<center>\n")
+       (let ((len (length authors)))
+	  (case len
+	     ((1)
+	      (output (car authors) e))
+	     ((2 3)
+	      (html-authorsN authors len #f))
+	     ((4)
+	      (html-authorsN authors 2 #f))
+	     (else
+	      (html-authorsN authors 3 #t))))
+       (display "</center>\n"))
+      (else
+       (html-title-authors (list authors) e))))
+
+;*---------------------------------------------------------------------*/
+;*    document-sui ...                                                 */
+;*---------------------------------------------------------------------*/
+(define (document-sui n e)
+   (define (sui)
+      (display "(sui \"")
+      (skribe-eval (markup-option n :title) html-title-engine)
+      (display "\"\n")
+      (printf "  :file ~s\n" (sui-referenced-file n e))
+      (sui-marks n e)
+      (sui-blocks 'chapter n e)
+      (sui-blocks 'section n e)
+      (sui-blocks 'subsection n e)
+      (sui-blocks 'subsubsection n e)
+      (display "  )\n"))
+   (if (string? *skribe-dest*)
+       (let ((f (format "~a.sui" (prefix *skribe-dest*))))
+	  (with-output-to-file f sui))
+       (sui)))
+
+;*---------------------------------------------------------------------*/
+;*    sui-referenced-file ...                                          */
+;*---------------------------------------------------------------------*/
+(define (sui-referenced-file n e)
+   (let ((file (html-file n e)))
+      (if (member (suffix file) '("skb" "sui" "skr" "html"))
+	  (string-append (strip-ref-base (prefix file)) ".html")
+	  file)))
+
+;*---------------------------------------------------------------------*/
+;*    sui-marks ...                                                    */
+;*---------------------------------------------------------------------*/
+(define (sui-marks n e)
+   (printf "  (marks")
+   (for-each (lambda (m)
+		(printf "\n    (~s" (markup-ident m))
+		(printf " :file ~s" (sui-referenced-file m e))
+		(printf " :mark ~s" (markup-ident m))
+		(when (markup-class m)
+		   (printf " :class ~s" (markup-class m)))
+		(display ")"))
+	     (search-down (lambda (n) (is-markup? n 'mark)) n))
+   (display ")\n"))
+
+;*---------------------------------------------------------------------*/
+;*    sui-blocks ...                                                   */
+;*---------------------------------------------------------------------*/
+(define (sui-blocks kind n e)
+   (printf "  (~as" kind)
+   (for-each (lambda (chap)
+		(display "\n    (\"")
+		(skribe-eval (markup-option chap :title) html-title-engine)
+		(printf "\" :file ~s" (sui-referenced-file chap e))
+		(printf " :mark ~s" (markup-ident chap))
+		(when (markup-class chap)
+		   (printf " :class ~s" (markup-class chap)))
+		(display ")"))
+	     (container-search-down (lambda (n) (is-markup? n kind)) n))
+   (display ")\n"))
+
+;*---------------------------------------------------------------------*/
+;*    author ...                                                       */
+;*---------------------------------------------------------------------*/
+(markup-writer 'author
+   :options '(:name :title :affiliation :email :url :address :phone :photo :align)
+   :before (lambda (n e)
+	      (display "<table")
+	      (html-class n)
+	      (display "><tbody>\n"))
+   :action (lambda (n e)
+	      (let ((name (markup-option n :name))
+		    (title (markup-option n :title))
+		    (affiliation (markup-option n :affiliation))
+		    (email (markup-option n :email))
+		    (url (markup-option n :url))
+		    (address (markup-option n :address))
+		    (phone (markup-option n :phone))
+		    (nfn (engine-custom e 'author-font))
+		    (align (markup-option n :align)))
+		 (define (row n)
+		    (printf "<tr><td align=\"~a\">" align)
+		    (output n e)
+		    (display "</td></tr>"))
+		 ;; name
+		 (printf "<tr><td align=\"~a\">" align)
+		 (if nfn
+		     (printf "<font ~a>\n" nfn)
+		     (display "<font size=\"+2\"><i>\n"))
+		 (output name e)
+		 (if nfn
+		     (printf "</font>\n")
+		     (display "</i></font>\n"))
+		 (display "</td></tr>")
+		 ;; title
+		 (if title (row title))
+		 ;; affiliation
+		 (if affiliation (row affiliation))
+		 ;; address
+		 (if (pair? address)
+		     (for-each row address))
+		 ;; telephone
+		 (if phone (row phone))
+		 ;; email
+		 (if email (row email))
+		 ;; url
+		 (if url (row url))))
+   :after "</tbody></table>")
+
+;*---------------------------------------------------------------------*/
+;*    author ...                                                       */
+;*---------------------------------------------------------------------*/
+(markup-writer 'author
+   :options '(:name :title :affiliation :email :url :address :phone :photo :align)
+   :predicate (lambda (n e) (markup-option n :photo))
+   :before (lambda (n e)
+	      (display "<table")
+	      (html-class n)
+	      (display "><tbody>\n<tr>"))
+   :action (lambda (n e)
+	      (let ((photo (markup-option n :photo)))
+		 (display "<td>")
+		 (output photo e)
+		 (display "</td><td>")
+		 (markup-option-add! n :photo #f)
+		 (output n e)
+		 (markup-option-add! n :photo photo)
+		 (display "</td>")))
+   :after "</tr>\n</tbody></table>")
+
+;*---------------------------------------------------------------------*/
+;*    toc ...                                                          */
+;*---------------------------------------------------------------------*/
+(markup-writer 'toc
+   :options 'all
+   :action (lambda (n e)
+	      (define (col n)
+		 (let loop ((i 0))
+		      (if (< i n)
+			  (begin
+			     (display "<td></td>")
+			     (loop (+ i 1))))))
+	      (define (toc-entry fe level)
+		 (let* ((c (car fe))
+			(ch (cdr fe))
+			(t (markup-option c :title))
+			(id (markup-ident c))
+			(f (html-file c e)))
+		    (unless (string? id)
+		       (skribe-error 'toc
+				     (format "Illegal identifier `~a'" id)
+				     c))
+		    (display " <tr>")
+		    ;; blank columns
+		    (col level)
+		    ;; number
+		    (printf "<td valign=\"top\" align=\"left\">~a</td>" 
+			    (html-container-number c e))
+		    ;; title
+		    (printf "<td colspan=\"~a\" width=\"100%\">"
+			    (- 4 level))
+		    (printf "<a href=\"~a#~a\">" 
+			    (if (string=? f *skribe-dest*)
+				""
+				(strip-ref-base (or f *skribe-dest* "")))
+			    (string-canonicalize id))
+		    (output (markup-option c :title) e)
+		    (display "</a></td>")
+		    (display "</tr>\n")
+		    ;; the children
+		    (for-each (lambda (n) (toc-entry n (+ 1 level))) ch)))
+	      (define (symbol->keyword s)
+		 (cond-expand
+		    (stklos
+		     (make-keyword s))
+		    (bigloo
+		     (string->keyword (string-append ":" (symbol->string s))))))
+	      (let* ((c (markup-option n :chapter))
+		     (s (markup-option n :section))
+		     (ss (markup-option n :subsection))
+		     (sss (markup-option n :subsubsection))
+		     (b (markup-body n))
+		     (bb (if (handle? b)
+			     (handle-ast b)
+			     b)))
+		 (if (not (container? bb))
+		     (error 'toc 
+			    "Illegal body (container expected)" 
+			    (if (markup? bb)
+				(markup-markup bb)
+				"???"))
+		     (let ((lst (find-down (lambda (x)
+					     (and (markup? x)
+						  (markup-option x :toc)
+						  (or (and sss (is-markup? x 'subsubsection))
+						      (and ss (is-markup? x 'subsection))
+						      (and s (is-markup? x 'section))
+						      (and c (is-markup? x 'chapter))
+						      (markup-option n (symbol->keyword 
+									(markup-markup x))))))
+					   (container-body bb))))
+		       ;; avoid to produce an empty table
+		       (unless (null? lst)
+			  (display "<table cellspacing=\"1\" cellpadding=\"1\" width=\"100%\"")
+			  (html-class n)
+			  (display ">\n<tbody>\n")
+			  
+			  (for-each (lambda (n) (toc-entry n 0)) lst)
+			  
+			  (display "</tbody>\n</table>\n")))))))
+
+;*---------------------------------------------------------------------*/
+;*    &html-generic-document ...                                       */
+;*---------------------------------------------------------------------*/
+(define (&html-generic-document n title e)
+   (let* ((id (markup-ident n))
+	  (header (new markup
+		     (markup '&html-chapter-header)
+		     (ident (string-append id "-header"))
+		     (class (markup-class n))
+		     (parent n)
+		     (body (html-browser-title n))))
+	  (head (new markup
+		   (markup '&html-head)
+		   (ident (string-append id "-head"))
+		   (class (markup-class n))
+		   (parent n)
+		   (body header)))
+	  (ftnote (new markup
+		     (markup '&html-footnotes)
+		     (ident (string-append id "-footnote"))
+		     (class (markup-class n))
+		     (parent n)
+		     (body (reverse! 
+			    (container-env-get n 'footnote-env)))))
+	  (page (new markup
+		   (markup '&html-page)
+		   (ident (string-append id "-page"))
+		   (class (markup-class n))
+		   (parent n)
+		   (body (list (markup-body n) ftnote))))
+	  (ending (new markup
+		     (markup '&html-ending)
+		     (ident (string-append id "-ending"))
+		     (class (markup-class n))
+		     (parent n)
+		     (body (or (markup-option n :ending)
+			       (let ((p (ast-document n)))
+				  (and p (markup-option p :ending)))))))
+	  (body (new markup 
+		   (markup '&html-body)
+		   (ident (string-append id "-body"))
+		   (class (markup-class n))
+		   (parent n)
+		   (body (list title page ending))))
+	  (html (new markup
+		   (markup '&html-html)
+		   (ident (string-append id "-html"))
+		   (class (markup-class n))
+		   (parent n)
+		   (body (list head body)))))
+      ;; No file must be opened for documents. These files are
+      ;; directly opened by Skribe
+      (if (document? n)
+	  (output html e)
+	  (with-output-to-file (html-file n e)
+	     (lambda ()
+		(output html e))))))
+
+;*---------------------------------------------------------------------*/
+;*    &html-generic-subdocument ...                                    */
+;*---------------------------------------------------------------------*/
+(define (&html-generic-subdocument n e)
+   (let* ((p (ast-document n))
+	  (id (markup-ident n))
+	  (ti (let* ((nb (html-container-number n e))
+		     (tc (markup-option n :title))
+		     (ti (if (document? p)
+			     (list (markup-option p :title) 
+				   (engine-custom e 'file-title-separator)
+				   tc)
+			     tc))
+		     (sep (engine-custom 
+			     e
+			     (symbol-append (markup-markup n) 
+					    '-title-number-separator)))
+		     (nti (and tc
+			       (if (and nb (not (equal? nb "")))
+				   (list nb 
+					 (if (unspecified? sep) ". " sep)
+					 ti)
+				   ti))))
+		 (new markup
+		    (markup (symbol-append '&html- (markup-markup n) '-title))
+		    (ident (string-append id "-title"))
+		    (parent n)
+		    (options '((author ())))
+		    (body nti)))))
+      (case (markup-markup n)
+	 ((chapter)
+	  (skribe-message "  [~s chapter: ~a]\n" (engine-ident e) id))
+	 ((section)
+	  (skribe-message "    [~s section: ~a]\n" (engine-ident e) id)))
+      (&html-generic-document n ti e)))
+
+;*---------------------------------------------------------------------*/
+;*    chapter ... @label chapter@                                      */
+;*---------------------------------------------------------------------*/
+(markup-writer 'chapter
+   :options '(:title :number :file :toc :html-title :env)
+   :before (lambda (n e)
+	      (let ((title (markup-option n :title))
+		    (ident (markup-ident n)))
+		 (display "<!-- ")
+		 (output title html-title-engine)
+		 (display " -->\n")
+		 (display "<a name=\"")
+		 (display (string-canonicalize ident))
+		 (display "\"></a>\n")
+		 (display "<center><h1")
+		 (html-class n)
+		 (display ">")
+		 (output (html-container-number n e) e)
+		 (display " ")
+		 (output (markup-option n :title) e)
+		 (display "</h1></center>")))
+   :after "<br>")
+
+;; This writer is invoked only for chapters rendered inside separate files!
+(markup-writer 'chapter
+   :options '(:title :number :file :toc :html-title :env)
+   :predicate (lambda (n e)
+		 (or (markup-option n :file)
+		     (engine-custom e 'chapter-file)))
+   :action &html-generic-subdocument)
+
+;*---------------------------------------------------------------------*/
+;*    html-section-title ...                                           */
+;*---------------------------------------------------------------------*/
+(define (html-section-title n e)
+   (let* ((title (markup-option n :title))
+	  (number (markup-option n :number))
+	  (c (markup-class n))
+	  (ident (markup-ident n))
+	  (kind (markup-markup n))
+	  (tbg (engine-custom e (symbol-append kind '-title-background)))
+	  (tfg (engine-custom e (symbol-append kind '-title-foreground)))
+	  (tstart (engine-custom e (symbol-append kind '-title-start)))
+	  (tstop (engine-custom e (symbol-append kind '-title-stop)))
+	  (nsep (engine-custom e (symbol-append kind '-title-number-separator))))
+      ;; the section header
+      (display "<!-- ")
+      (output title html-title-engine)
+      (display " -->\n")
+      (display "<a name=\"")
+      (display (string-canonicalize ident))
+      (display "\"></a>\n")
+      (if c
+	  (printf "<div class=\"~a-atitle\">" c)
+	  (printf "<div class=\"skribe~atitle\">" (markup-markup n)))
+      (when (html-color-spec? tbg)
+	 (display "<table width=\"100%\">")
+	 (printf "<tr><td bgcolor=\"~a\">" tbg))
+      (display tstart)
+      (if tfg (printf "<font color=\"~a\">" tfg))
+      (if number
+	  (begin
+	     (output (html-container-number n e) e)
+	     (output nsep e)))
+      (output title e)
+      (if tfg (display "</font>\n"))
+      (display tstop)
+      (when (and (string? tbg) (> (string-length tbg) 0))
+	 (display "</td></tr></table>\n"))
+      (display "</div>")
+      (display "<div")
+      (html-class n)
+      (display ">"))
+   (newline))
+
+;*---------------------------------------------------------------------*/
+;*    section ...  @label section@                                     */
+;*---------------------------------------------------------------------*/
+(markup-writer 'section
+   :options '(:title :html-title :number :toc :file :env)
+   :before html-section-title
+   :after "</div><br>\n")
+
+;; on-file section writer
+(markup-writer 'section
+   :options '(:title :html-title :number :toc :file :env)
+   :predicate (lambda (n e) 
+		 (or (markup-option n :file)
+		     (engine-custom e 'section-file)))
+   :action &html-generic-subdocument)
+
+;*---------------------------------------------------------------------*/
+;*    subsection ... @label subsection@                                */
+;*---------------------------------------------------------------------*/
+(markup-writer 'subsection
+   :options '(:title :html-title :number :toc :env :file)
+   :before html-section-title
+   :after "</div>\n")
+		     
+;; on-file subsection writer
+(markup-writer 'section
+   :options '(:title :html-title :number :toc :file :env)
+   :predicate (lambda (n e) 
+		 (or (markup-option n :file)
+		     (engine-custom e 'subsection-file)))
+   :action &html-generic-subdocument)
+
+;*---------------------------------------------------------------------*/
+;*    subsubsection ... @label subsubsection@                          */
+;*---------------------------------------------------------------------*/
+(markup-writer 'subsubsection
+   :options '(:title :html-title :number :toc :env :file)
+   :before html-section-title
+   :after "</div>\n")
+
+;; on-file subsection writer
+(markup-writer 'section
+   :options '(:title :html-title :number :toc :file :env)
+   :predicate (lambda (n e) 
+		 (or (markup-option n :file)
+		     (engine-custom e 'subsubsection-file)))
+   :action &html-generic-subdocument)
+
+;*---------------------------------------------------------------------*/
+;*    paragraph ...                                                    */
+;*---------------------------------------------------------------------*/
+(markup-writer 'paragraph 
+   :before (lambda (n e)
+	      (when (and (>= (skribe-debug) 2) (location? (ast-loc n)))
+		 (printf "<span style=\"display: block; position: relative; left: -2cm; font-size: x-small; font-style: italic; color: ff8e1e;\">~a</span>"
+			 (ast-location n)))
+	      ((html-markup-class "p") n e))
+   :after "</p>")
+
+;*---------------------------------------------------------------------*/
+;*    footnote ...                                                     */
+;*---------------------------------------------------------------------*/
+(markup-writer 'footnote
+   :options '(:number)
+   :action (lambda (n e)
+	      (printf "<a href=\"#footnote-~a\"><sup><small>~a</small></sup></a>"
+		      (string-canonicalize (container-ident n))
+		      (markup-option n :number))))
+
+;*---------------------------------------------------------------------*/
+;*    linebreak ...                                                    */
+;*---------------------------------------------------------------------*/
+(markup-writer 'linebreak 
+	       :before (lambda (n e)
+			  (display "<br")
+			  (html-class n)
+			  (display "/>")))
+
+;*---------------------------------------------------------------------*/
+;*    hrule ...                                                        */
+;*---------------------------------------------------------------------*/
+(markup-writer 'hrule 
+   :options '(:width :height)
+   :before (lambda (n e)
+	      (let ((width (markup-option n :width))
+		    (height (markup-option n :height)))
+		 (display "<hr")
+		 (html-class n)
+		 (if (< width 100) 
+		     (printf " width=\"~a\"" (html-width width)))
+		 (if (> height 1)
+		     (printf " size=\"~a\"" height))
+		 (display ">"))))
+
+;*---------------------------------------------------------------------*/
+;*    color ...                                                        */
+;*---------------------------------------------------------------------*/
+(markup-writer 'color
+   :options '(:bg :fg :width :margin)
+   :before (lambda (n e) 
+	      (let ((m (markup-option n :margin))
+		    (w (markup-option n :width))
+		    (bg (markup-option n :bg))
+		    (fg (markup-option n :fg)))
+		 (when (html-color-spec? bg)
+		    (display "<table cellspacing=\"0\"")
+		    (html-class n)
+		    (printf " cellpadding=\"~a\"" (if m m 0))
+		    (if w (printf " width=\"~a\"" (html-width w)))
+		    (display "><tbody>\n<tr>")
+		    (display "<td bgcolor=\"")
+		    (output bg e)
+		    (display "\">"))
+		 (when (html-color-spec? fg) 
+		    (display "<font color=\"")
+		    (output fg e)
+		    (display "\">"))))
+   :after (lambda (n e)
+	     (when (html-color-spec? (markup-option n :fg))
+		(display "</font>"))
+	     (when (html-color-spec? (markup-option n :bg))
+		(display "</td></tr>\n</tbody></table>"))))
+
+;*---------------------------------------------------------------------*/
+;*    frame ...                                                        */
+;*---------------------------------------------------------------------*/
+(markup-writer 'frame
+   :options '(:width :margin :border)
+   :before (lambda (n e) 
+	      (let ((m (markup-option n :margin))
+		    (b (markup-option n :border))
+		    (w (markup-option n :width)))
+		 (display "<table cellspacing=\"0\"")
+		 (html-class n)
+		 (printf " cellpadding=\"~a\"" (if m m 0))
+		 (printf " border=\"~a\"" (if b b 0))
+		 (if w (printf " width=\"~a\"" (html-width w)))
+		 (display "><tbody>\n<tr><td>")))
+   :after "</td></tr>\n</tbody></table>")
+
+;*---------------------------------------------------------------------*/
+;*    font ...                                                         */
+;*---------------------------------------------------------------------*/
+(markup-writer 'font
+   :options '(:size :face)
+   :before (lambda (n e) 
+	      (let ((size (markup-option n :size))
+		    (face (markup-option n :face)))
+		 (when (and (number? size) (inexact? size))
+		    (let ((s (if (> size 0) "<big>" "<small>"))
+			  (d (if (> size 0) 1 -1)))
+		       (do ((i (inexact->exact size) (- i d)))
+			   ((= i 0))
+			   (display s))))
+		 (when (or (and (number? size) (exact? size)) face)
+		    (display "<font")
+		    (html-class n)
+		    (when (and (number? size) (exact? size) (not (= size 0)))
+		       (printf " size=\"~a\"" size))
+		    (when face (printf " face=\"~a\"" face))
+		    (display ">"))))
+   :after (lambda (n e)
+	     (let ((size (markup-option n :size))
+		   (face (markup-option n :face)))
+		(when (or (and (number? size) (exact? size) (not (= size 0)))
+			  face)
+		   (display "</font>"))
+		(when (and (number? size) (inexact? size))
+		   (let ((s (if (> size 0) "</big>" "</small>"))
+			 (d (if (> size 0) 1 -1)))
+		      (do ((i (inexact->exact size) (- i d)))
+			  ((= i 0))
+			  (display s)))))))
+
+;*---------------------------------------------------------------------*/
+;*    flush ...                                                        */
+;*---------------------------------------------------------------------*/
+(markup-writer 'flush
+   :options '(:side)
+   :before (lambda (n e)
+	      (case (markup-option n :side)
+		 ((center)
+		  (display "<center")
+		  (html-class n)
+		  (display ">\n"))
+		 ((left)
+		  (display "<p style=\"text-align:left;\"")
+		  (html-class n)
+		  (display ">\n"))
+		 ((right)
+		  (display "<table ")
+		  (html-class n)
+		  (display "width=\"100%\" cellpadding=\"0\" cellspacing=\"0\" border=\"0\"><tr><td align=\"right\">"))
+		 (else
+		  (skribe-error 'flush 
+				"Illegal side" 
+				(markup-option n :side)))))
+   :after (lambda (n e)
+	     (case (markup-option n :side)
+		((center)
+		 (display "</center>\n"))
+		((right)
+		 (display "</td></tr></table>\n"))
+		((left)
+		 (display "</p>\n")))))
+
+;*---------------------------------------------------------------------*/
+;*    center ...                                                       */
+;*---------------------------------------------------------------------*/
+(markup-writer 'center
+   :before (html-markup-class "center")
+   :after "</center>\n")
+
+;*---------------------------------------------------------------------*/
+;*    pre ...                                                          */
+;*---------------------------------------------------------------------*/
+(markup-writer 'pre :before (html-markup-class "pre") :after "</pre>\n")
+
+;*---------------------------------------------------------------------*/
+;*    prog ...                                                         */
+;*---------------------------------------------------------------------*/
+(markup-writer 'prog
+   :options '(:line :mark)
+   :before (html-markup-class "pre")
+   :after "</pre>\n")
+
+;*---------------------------------------------------------------------*/
+;*    itemize ...                                                      */
+;*---------------------------------------------------------------------*/
+(markup-writer 'itemize
+   :options '(:symbol)	       
+   :before (html-markup-class "ul")
+   :action (lambda (n e)
+	      (for-each (lambda (item)
+			   (display "<li")
+			   (html-class item)
+			   (display ">")
+			   (output item e)
+			   (display "</li>\n"))
+			(markup-body n)))
+   :after "</ul>")
+
+;*---------------------------------------------------------------------*/
+;*    enumerate ...                                                    */
+;*---------------------------------------------------------------------*/
+(markup-writer 'enumerate
+   :options '(:symbol)	       
+   :before (html-markup-class "ol")
+   :action (lambda (n e)
+	      (for-each (lambda (item)
+			   (display "<li")
+			   (html-class item)
+			   (display ">")
+			   (output item e)
+			   (display "</li>\n"))
+			(markup-body n)))
+   :after "</ol>")
+
+;*---------------------------------------------------------------------*/
+;*    description ...                                                  */
+;*---------------------------------------------------------------------*/
+(markup-writer 'description
+   :options '(:symbol)	       
+   :before (html-markup-class "dl")
+   :action (lambda (n e)
+	      (for-each (lambda (item)
+			   (let ((k (markup-option item :key)))
+			      (for-each (lambda (i)
+					   (display " <dt")
+					   (html-class i)
+					   (display ">")
+					   (output i e)
+					   (display "</dt>"))
+					(if (pair? k) k (list k)))
+			      (display "<dd")
+			      (html-class item)
+			      (display ">")
+			      (output (markup-body item) e)
+			      (display "</dd>\n")))
+			(markup-body n)))
+   :after "</dl>")
+
+;*---------------------------------------------------------------------*/
+;*    item ...                                                         */
+;*---------------------------------------------------------------------*/
+(markup-writer 'item
+   :options '(:key)	       
+   :action (lambda (n e)
+	      (let ((k (markup-option n :key)))
+		 (if k
+		     (begin
+			(display "<b")
+			(html-class n)
+			(display ">")
+			(output k e)
+			(display "</b> "))))
+	      (output (markup-body n) e)))
+
+;*---------------------------------------------------------------------*/
+;*    blockquote ...                                                   */
+;*---------------------------------------------------------------------*/
+(markup-writer 'blockquote 
+   :options '()
+   :before (lambda (n e) 
+	     (display "<blockquote ")
+	     (html-class n)
+	     (display ">\n"))
+   :after "\n</blockquote>\n")
+
+;*---------------------------------------------------------------------*/
+;*    figure ... @label figure@                                        */
+;*---------------------------------------------------------------------*/
+(markup-writer 'figure
+   :options '(:legend :number :multicolumns :legend-width)
+   :before (html-markup-class "br")
+   :action (lambda (n e)
+	      (let ((ident (markup-ident n))
+		    (number (markup-option n :number))
+		    (legend (markup-option n :legend)))
+		 (display "<a name=\"")
+		 (display (string-canonicalize ident))
+		 (display "\"></a>\n")
+		 (output (markup-body n) e)
+		 (display "<br>\n")
+		 (output (new markup
+			    (markup '&html-figure-legend)
+			    (parent n)
+			    (ident (string-append ident "-legend"))
+			    (class (markup-class n))
+			    (options `((:number ,number)))
+			    (body legend))
+			 e)))
+   :after "<br>")
+
+;*---------------------------------------------------------------------*/
+;*    &html-figure-legend ...                                          */
+;*---------------------------------------------------------------------*/
+(markup-writer '&html-figure-legend 
+   :options '(:number)
+   :before (lambda (n e)
+	      (display "<center>")
+	      (let ((number (markup-option n :number))
+		    (legend (markup-option n :legend)))
+		 (if number 
+		     (printf "<strong>Fig. ~a:</strong> " number)
+		     (printf "<strong>Fig. :</strong> "))))
+   :after "</center>")
+   
+;*---------------------------------------------------------------------*/
+;*    table ...                                                        */
+;*---------------------------------------------------------------------*/
+(markup-writer 'table
+   :options '(:border :width :frame :rules :cellstyle :cellpadding :cellspacing)
+   :before (lambda (n e)
+	      (let ((width (markup-option n :width))
+		    (border (markup-option n :border))
+		    (frame (markup-option n :frame))
+		    (rules (markup-option n :rules))
+		    (cstyle (markup-option n :cellstyle))
+		    (cp (markup-option n :cellpadding))
+		    (cs (markup-option n :cellspacing)))
+		 (display "<table")
+		 (html-class n)
+		 (if width (printf " width=\"~a\"" (html-width width)))
+		 (if border (printf " border=\"~a\"" border))
+		 (if (and (number? cp) (>= cp 0))
+		     (printf " cellpadding=\"~a\"" cp))
+		 (if (and (number? cs) (>= cs 0))
+		     (printf " cellspacing=\"~a\"" cs))
+		 (cond
+		    ((symbol? cstyle)
+		     (printf " style=\"border-collapse: ~a;\"" cstyle))
+		    ((string? cstyle)
+		     (printf " style=\"border-collapse: separate; border-spacing=~a\"" cstyle))
+		    ((number? cstyle)
+		     (printf " style=\"border-collapse: separate; border-spacing=~apt\"" cstyle)))
+		 (if frame
+		     (printf " frame=\"~a\"" 
+			     (if (eq? frame 'none) "void" frame)))
+		 (if (and rules (not (eq? rules 'header)))
+		     (printf " rules=\"~a\"" rules))
+		 (display "><tbody>\n")))
+   :after "</tbody></table>\n")
+
+;*---------------------------------------------------------------------*/
+;*    tr ...                                                           */
+;*---------------------------------------------------------------------*/
+(markup-writer 'tr
+   :options '(:bg)
+   :before (lambda (n e)
+	      (let ((bg (markup-option n :bg)))
+		 (display "<tr")
+		 (html-class n)
+		 (when (html-color-spec? bg) (printf " bgcolor=\"~a\"" bg))
+		 (display ">")))
+   :after "</tr>\n")
+	      
+;*---------------------------------------------------------------------*/
+;*    tc ...                                                           */
+;*---------------------------------------------------------------------*/
+(markup-writer 'tc
+   :options '(markup :width :align :valign :colspan :rowspan :bg)
+   :before (lambda (n e)
+	      (let ((markup (or (markup-option n 'markup) 'td))
+		    (width (markup-option n :width))
+		    (align (markup-option n :align))
+		    (valign (let ((v (markup-option n :valign)))
+			       (cond
+				  ((or (eq? v 'center)
+				       (equal? v "center"))
+				   "middle")
+				  (else
+				   v))))
+		    (colspan (markup-option n :colspan))
+		    (rowspan (markup-option n :rowspan))
+		    (bg (markup-option n :bg)))
+		 (printf "<~a" markup)
+		 (html-class n)
+		 (if width (printf " width=\"~a\"" (html-width width)))
+		 (if align (printf " align=\"~a\"" align))
+		 (if valign (printf " valign=\"~a\"" valign))
+		 (if colspan (printf " colspan=\"~a\"" colspan))
+		 (if rowspan (printf " rowspan=\"~a\"" rowspan))
+		 (when (html-color-spec? bg)
+		    (printf " bgcolor=\"~a\"" bg))
+		 (display ">")))
+   :after (lambda (n e)
+	     (let ((markup (or (markup-option n 'markup) 'td)))
+		(printf "</~a>" markup))))
+	      
+;*---------------------------------------------------------------------*/
+;*    image ... @label image@                                          */
+;*---------------------------------------------------------------------*/
+(markup-writer 'image
+   :options '(:file :url :width :height)
+   :action (lambda (n e)
+	      (let* ((file (markup-option n :file))
+		     (url (markup-option n :url))
+		     (width (markup-option n :width))
+		     (height (markup-option n :height))
+		     (body (markup-body n))
+		     (efmt (engine-custom e 'image-format))
+		     (img (or url (convert-image file 
+						 (if (list? efmt)
+						     efmt
+						     '("gif" "jpg" "png"))))))
+		 (if (not (string? img))
+		     (skribe-error 'html "Illegal image" file)
+		     (begin
+			(printf "<img src=\"~a\" border=\"0\"" img)
+			(html-class n)
+			(if body
+			    (begin
+			       (display " alt=\"")
+			       (output body e)
+			       (display "\""))
+			    (printf " alt=\"~a\"" file))
+			(if width (printf " width=\"~a\"" (html-width width)))
+			(if height (printf " height=\"~a\"" height))
+			(display ">"))))))
+
+;*---------------------------------------------------------------------*/
+;*    Ornaments ...                                                    */
+;*---------------------------------------------------------------------*/
+(markup-writer 'roman :before "")
+(markup-writer 'bold :before (html-markup-class "strong") :after "</strong>")
+(markup-writer 'underline :before (html-markup-class "u") :after "</u>")
+(markup-writer 'strike :before (html-markup-class "strike") :after "</strike>")
+(markup-writer 'emph :before (html-markup-class "em") :after "</em>")
+(markup-writer 'kbd :before (html-markup-class "kbd") :after "</kbd>")
+(markup-writer 'it :before (html-markup-class "em") :after "</em>")
+(markup-writer 'tt :before (html-markup-class "tt") :after "</tt>")
+(markup-writer 'code :before (html-markup-class "code") :after "</code>")
+(markup-writer 'var :before (html-markup-class "var") :after "</var>")
+(markup-writer 'samp :before (html-markup-class "samp") :after "</samp>")
+(markup-writer 'sc :before "<span class=\"sc\">" :after "</span>")
+(markup-writer 'sf :before "<span class=\"sf\">" :after "</span>")
+(markup-writer 'sub :before (html-markup-class "sub") :after "</sub>")
+(markup-writer 'sup :before (html-markup-class "sup") :after "</sup>")
+
+;*---------------------------------------------------------------------*/
+;*    q ... @label q@                                                  */
+;*---------------------------------------------------------------------*/
+(markup-writer 'q
+   :before "\""
+   :after "\"")
+
+;*---------------------------------------------------------------------*/
+;*    mailto ... @label mailto@                                        */
+;*---------------------------------------------------------------------*/
+(markup-writer 'mailto
+   :options '(:text)
+   :action (lambda (n e)
+	      (let ((text (markup-option n :text)))
+		 (display "<a href=\"mailto:")
+		 (output (markup-body n) e)
+		 (display #\")
+		 (html-class n)
+		 (display #\>)
+		 (if text
+		     (output text e)
+		     (skribe-eval (tt (markup-body n)) e))
+		 (display "</a>"))))
+
+;*---------------------------------------------------------------------*/
+;*    mailto ... @label mailto@                                        */
+;*---------------------------------------------------------------------*/
+(markup-writer 'mailto
+   :options '(:text)
+   :predicate (lambda (n e) 
+		 (and (engine-custom e 'javascript)
+		      (or (string? (markup-body n))
+			  (and (pair? (markup-body n))
+			       (null? (cdr (markup-body n)))
+			       (string? (car (markup-body n)))))))
+   :action (lambda (n e)
+	      (let* ((body (markup-body n))
+		     (email (if (string? body) body (car body)))
+		     (split (pregexp-split "@" email))
+		     (na (car split))
+		     (do (if (pair? (cdr split)) (cadr split) ""))
+		     (nn (pregexp-replace* "[.]" na " "))
+		     (dd (pregexp-replace* "[.]" do " "))
+		     (text (markup-option n :text)))
+		(display "<script language=\"JavaScript\" type=\"text/javascript\"")
+		(if (not text)
+		    (printf ">skribenospam( ~s, ~s, true )" nn dd)
+		    (begin
+		      (printf ">skribenospam( ~s, ~s, false )" nn dd)
+		      (display "</script>")
+		      (output text e)
+		      (display "<script language=\"JavaScript\" type=\"text/javascript\">document.write(\"</\" + \"a>\")")))
+		(display "</script>\n"))))
+
+;*---------------------------------------------------------------------*/
+;*    mark ... @label mark@                                            */
+;*---------------------------------------------------------------------*/
+(markup-writer 'mark
+   :before (lambda (n e)
+	      (printf "<a name=\"~a\"" (string-canonicalize (markup-ident n)))
+	      (html-class n)
+	      (display ">"))
+   :after "</a>")
+
+;*---------------------------------------------------------------------*/
+;*    ref ... @label ref@                                              */
+;*---------------------------------------------------------------------*/
+(markup-writer 'ref
+   :options '(:text :chapter :section :subsection :subsubsection :figure :mark :handle)
+   :before (lambda (n e)
+	      (let* ((c (handle-ast (markup-body n)))
+		     (id (markup-ident c))
+		     (f (html-file c e))
+		     (class (if (markup-class n)
+				(markup-class n)
+				"inbound")))
+		 (printf "<a href=\"~a#~a\" class=\"~a\""
+			 (if (string=? f *skribe-dest*)
+			     ""
+			     (strip-ref-base (or f *skribe-dest* "")))
+			 (string-canonicalize id)
+			 class)
+		 (display ">")))
+   :action (lambda (n e)
+	      (let ((t (markup-option n :text))
+		    (m (markup-option n 'mark))
+		    (f (markup-option n :figure))
+		    (c (markup-option n :chapter))
+		    (s (markup-option n :section))
+		    (ss (markup-option n :subsection))
+		    (sss (markup-option n :subsubsection)))
+		 (cond
+		    (t
+		     (output t e))
+		    (f
+		     (output (new markup
+				(markup '&html-figure-ref)
+				(body (markup-body n)))
+			     e))
+		    ((or c s ss sss)
+		     (output (new markup
+				(markup '&html-section-ref)
+				(body (markup-body n)))
+			     e))
+					
+		    ((not m)
+		     (output (new markup
+				(markup '&html-unmark-ref)
+				(body (markup-body n)))
+			     e))
+		    (else
+		     (display m)))))
+   :after "</a>")
+
+;*---------------------------------------------------------------------*/
+;*    &html-figure-ref ...                                             */
+;*---------------------------------------------------------------------*/
+(markup-writer '&html-figure-ref 
+   :action (lambda (n e)
+	      (let ((c (handle-ast (markup-body n))))
+		 (if (or (not (markup? c))
+			 (not (is-markup? c 'figure)))
+		     (display "???")
+		     (output (markup-option c :number) e)))))
+
+;*---------------------------------------------------------------------*/
+;*    &html-section-ref ...                                            */
+;*---------------------------------------------------------------------*/
+(markup-writer '&html-section-ref 
+   :action (lambda (n e)
+	      (let ((c (handle-ast (markup-body n))))
+		 (if (not (markup? c))
+		     (display "???")
+		     (output (markup-option c :title) e)))))
+
+;*---------------------------------------------------------------------*/
+;*    &html-unmark-ref ...                                             */
+;*---------------------------------------------------------------------*/
+(markup-writer '&html-unmark-ref 
+   :action (lambda (n e)
+	      (let ((c (handle-ast (markup-body n))))
+		 (if (not (markup? c))
+		     (display "???")
+		     (let ((t (markup-option c :title)))
+			(if t
+			    (output t e)
+			    (let ((l (markup-option c :legend)))
+			       (if l
+				   (output t e)
+				   (display 
+				    (string-canonicalize 
+				     (markup-ident c)))))))))))
+
+;*---------------------------------------------------------------------*/
+;*    bib-ref ...                                                      */
+;*---------------------------------------------------------------------*/
+(markup-writer 'bib-ref
+   :options '(:text :bib)
+   :before "["
+   :action (lambda (n e) (output n e (markup-writer-get 'ref e)))
+   :after "]")
+
+;*---------------------------------------------------------------------*/
+;*    bib-ref+ ...                                                     */
+;*---------------------------------------------------------------------*/
+(markup-writer 'bib-ref+
+   :options '(:text :bib)
+   :before "["
+   :action (lambda (n e) 
+	      (let loop ((rs (markup-body n)))
+		 (cond
+		    ((null? rs)
+		     #f)
+		    (else
+		     (if (is-markup? (car rs) 'bib-ref)
+			 (output (car rs) e (markup-writer-get 'ref e))
+			 (output (car rs) e))
+		     (if (pair? (cdr rs))
+			 (begin
+			    (display ",")
+			    (loop (cdr rs))))))))
+   :after "]")
+
+;*---------------------------------------------------------------------*/
+;*    url-ref ...                                                      */
+;*---------------------------------------------------------------------*/
+(markup-writer 'url-ref
+   :options '(:url :text)
+   :before (lambda (n e)
+	      (let* ((url (markup-option n :url))
+		     (class (cond
+			       ((markup-class n)
+				(markup-class n))
+			       ((not (string? url))
+				#f)
+			       (else
+				(let ((l (string-length url)))
+				   (let loop ((i 0))
+				      (cond
+					 ((= i l)
+					  #f)
+					 ((char=? (string-ref url i) #\:)
+					  (substring url 0 i))
+					 (else
+					  (loop (+ i 1))))))))))
+		 (display "<a href=\"")
+		 (output url html-title-engine)
+		 (display "\"")
+		 (when class (printf " class=\"~a\"" class))
+		 (display ">")))
+   :action (lambda (n e) 
+	      (let ((v (markup-option n :text)))
+		 (output (or v (markup-option n :url)) e)))
+   :after "</a>")
+
+;*---------------------------------------------------------------------*/
+;*    line-ref ...                                                     */
+;*---------------------------------------------------------------------*/
+(markup-writer 'line-ref
+   :options '(:offset)
+   :before (html-markup-class "i")
+   :action (lambda (n e)
+	      (let ((o (markup-option n :offset))
+		    (v (string->number (markup-option n :text))))
+		 (if (and (number? o) (number? v))
+		     (markup-option-add! n :text (+ o v)))
+		 (output n e (markup-writer-get 'ref e))
+		 (if (and (number? o) (number? v))
+		     (markup-option-add! n :text v))))
+   :after "</i>")
+
+;*---------------------------------------------------------------------*/
+;*    page-ref ...                                                     */
+;*---------------------------------------------------------------------*/
+(markup-writer 'page-ref
+   :options '(:mark :handle)
+   :action (lambda (n e)
+	      (error 'page-ref:html "Not implemented yet" n)))
+   
+;*---------------------------------------------------------------------*/
+;*    &bib-entry-label ...                                             */
+;*---------------------------------------------------------------------*/
+(markup-writer '&bib-entry-label
+   :options '(:title)
+   :before (lambda (n e)
+	      (printf "<a name=\"~a\"" (string-canonicalize (markup-ident n)))
+	      (html-class n)
+	      (display ">"))
+   :action (lambda (n e)
+	      (output n e (markup-writer-get '&bib-entry-label base-engine)))
+   :after "</a>")
+
+;*---------------------------------------------------------------------*/
+;*    &bib-entry-title ...                                             */
+;*---------------------------------------------------------------------*/
+(markup-writer '&bib-entry-title
+   :action (lambda (n e)
+	      (let* ((t (bold (markup-body n)))
+		     (en (handle-ast (ast-parent n)))
+		     (url (or (markup-option en 'url)
+			      (markup-option en 'documenturl)))
+		     (ht (if url (ref :url (markup-body url) :text t) t)))
+		 (skribe-eval ht e))))
+
+;*---------------------------------------------------------------------*/
+;*    &bib-entry-url ...                                               */
+;*---------------------------------------------------------------------*/
+(markup-writer '&bib-entry-url
+   :action (lambda (n e)
+	      (let* ((en (handle-ast (ast-parent n)))
+		     (url (markup-option en 'url))
+		     (t (bold (markup-body url))))
+		 (skribe-eval (ref :url (markup-body url) :text t) e))))
+
+;*---------------------------------------------------------------------*/
+;*    &the-index-header ...                                            */
+;*---------------------------------------------------------------------*/
+(markup-writer '&the-index-header
+   :action (lambda (n e)
+	      (display "<center")
+	      (html-class n)
+	      (display ">")
+	      (for-each (lambda (h)
+			   (let ((f (engine-custom e 'index-header-font-size)))
+			      (if f
+				  (skribe-eval (font :size f (bold (it h))) e)
+				  (output h e))
+			      (display " ")))
+			(markup-body n))
+	      (display "</center>")
+	      (skribe-eval (linebreak 2) e)))
+
+;*---------------------------------------------------------------------*/
+;*    &source-comment ...                                              */
+;*---------------------------------------------------------------------*/
+(markup-writer '&source-comment
+   :action (lambda (n e)
+	      (let* ((cc (engine-custom e 'source-comment-color))
+		     (n1 (it (markup-body n)))
+		     (n2 (if (and (engine-custom e 'source-color) cc)
+			     (color :fg cc n1)
+			     n1)))
+		 (skribe-eval n2 e))))
+	      
+;*---------------------------------------------------------------------*/
+;*    &source-line-comment ...                                         */
+;*---------------------------------------------------------------------*/
+(markup-writer '&source-line-comment
+   :action (lambda (n e)
+	      (let* ((cc (engine-custom e 'source-comment-color))
+		     (n1 (bold (markup-body n)))
+		     (n2 (if (and (engine-custom e 'source-color) cc)
+			     (color :fg cc n1)
+			     n1)))
+		 (skribe-eval n2 e))))
+	      
+;*---------------------------------------------------------------------*/
+;*    &source-keyword ...                                              */
+;*---------------------------------------------------------------------*/
+(markup-writer '&source-keyword
+   :action (lambda (n e)
+	      (skribe-eval (bold (markup-body n)) e)))
+
+;*---------------------------------------------------------------------*/
+;*    &source-error ...                                                */
+;*---------------------------------------------------------------------*/
+(markup-writer '&source-error
+   :action (lambda (n e)
+	      (let* ((cc (engine-custom e 'source-error-color))
+		     (n1 (bold (markup-body n)))
+		     (n2 (if (and (engine-custom e 'source-color) cc)
+			     (color :fg cc n1)
+			     n1)))
+		 (skribe-eval n2 e))))
+
+;*---------------------------------------------------------------------*/
+;*    &source-define ...                                               */
+;*---------------------------------------------------------------------*/
+(markup-writer '&source-define
+   :action (lambda (n e)
+	      (let* ((cc (engine-custom e 'source-define-color))
+		     (n1 (bold (markup-body n)))
+		     (n2 (if (and (engine-custom e 'source-color) cc)
+			     (color :fg cc n1)
+			     n1)))
+		 (skribe-eval n2 e))))
+
+;*---------------------------------------------------------------------*/
+;*    &source-module ...                                               */
+;*---------------------------------------------------------------------*/
+(markup-writer '&source-module
+   :action (lambda (n e)
+	      (let* ((cc (engine-custom e 'source-module-color))
+		     (n1 (bold (markup-body n)))
+		     (n2 (if (and (engine-custom e 'source-color) cc)
+			     (color :fg cc n1)
+			     n1)))
+		 (skribe-eval n2 e))))
+
+;*---------------------------------------------------------------------*/
+;*    &source-markup ...                                               */
+;*---------------------------------------------------------------------*/
+(markup-writer '&source-markup
+   :action (lambda (n e)
+	      (let* ((cc (engine-custom e 'source-markup-color))
+		     (n1 (bold (markup-body n)))
+		     (n2 (if (and (engine-custom e 'source-color) cc)
+			     (color :fg cc n1)
+			     n1)))
+		 (skribe-eval n2 e))))
+
+;*---------------------------------------------------------------------*/
+;*    &source-thread ...                                               */
+;*---------------------------------------------------------------------*/
+(markup-writer '&source-thread
+   :action (lambda (n e)
+	      (let* ((cc (engine-custom e 'source-thread-color))
+		     (n1 (bold (markup-body n)))
+		     (n2 (if (and (engine-custom e 'source-color) cc)
+			     (color :fg cc n1)
+			     n1)))
+		 (skribe-eval n2 e))))
+
+;*---------------------------------------------------------------------*/
+;*    &source-string ...                                               */
+;*---------------------------------------------------------------------*/
+(markup-writer '&source-string
+   :action (lambda (n e)
+	      (let* ((cc (engine-custom e 'source-string-color))
+		     (n1 (markup-body n))
+		     (n2 (if (and (engine-custom e 'source-color) cc)
+			     (color :fg cc n1)
+			     n1)))
+		 (skribe-eval n2 e))))
+
+;*---------------------------------------------------------------------*/
+;*    &source-bracket ...                                               */
+;*---------------------------------------------------------------------*/
+(markup-writer '&source-bracket
+   :action (lambda (n e)
+	      (let* ((cc (engine-custom e 'source-bracket-color))
+		     (n1 (markup-body n))
+		     (n2 (if (and (engine-custom e 'source-color) cc)
+			     (color :fg cc (bold n1))
+			     (bold n1))))
+		 (skribe-eval n2 e))))
+
+;*---------------------------------------------------------------------*/
+;*    &source-type ...                                                 */
+;*---------------------------------------------------------------------*/
+(markup-writer '&source-type
+   :action (lambda (n e)
+	      (let* ((cc (engine-custom e 'source-type-color))
+		     (n1 (markup-body n))
+		     (n2 (if (and (engine-custom e 'source-color) cc)
+			     (color :fg cc n1)
+			     (it n1))))
+		 (skribe-eval n2 e))))
+
+;*---------------------------------------------------------------------*/
+;*    &source-key ...                                                  */
+;*---------------------------------------------------------------------*/
+(markup-writer '&source-key
+   :action (lambda (n e)
+	      (let* ((cc (engine-custom e 'source-type-color))
+		     (n1 (markup-body n))
+		     (n2 (if (and (engine-custom e 'source-color) cc)
+			     (color :fg cc (bold n1))
+			     (it n1))))
+		 (skribe-eval n2 e))))
+
+;*---------------------------------------------------------------------*/
+;*    &source-type ...                                                 */
+;*---------------------------------------------------------------------*/
+(markup-writer '&source-type
+   :action (lambda (n e)
+	      (let* ((cc (engine-custom e 'source-type-color))
+		     (n1 (markup-body n))
+		     (n2 (if (and (engine-custom e 'source-color) cc)
+			     (color :fg "red" (bold n1))
+			     (bold n1))))
+		 (skribe-eval n2 e))))
+
+;*---------------------------------------------------------------------*/
+;*    Restore the base engine                                          */
+;*---------------------------------------------------------------------*/
+(default-engine-set! (find-engine 'base))
-- 
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