XHTML is an XML application that is good for World Wide Web documents, particularly in
Probably most of the things you can do with XHTML can be done with your own custom XML documents and style sheets. "Forms" may be an exception, though work is underway on XForms.
Anyway, it's probably good to have a "standard" XML app that everyone knows!
| Version | Public ID | Official Specification (req'd reading) |
|---|---|---|
| XHTML 1.0 Strict | -//W3C//DTD XHTML 1.0 Strict//EN | http://www.w3.org/TR/xhtml1/ |
| XHTML 1.0 Transitional | -//W3C//DTD XHTML 1.0 Transitional//EN | |
| XHTML 1.0 Frameset | -//W3C//DTD XHTML 1.0 Frameset//EN | |
| XHTML 1.1 | -//W3C//DTD XHTML 1.1//EN | http://www.w3.org/TR/xhtml11/ |
| XHTML 2.0 | ??? | http://www.w3.org/TR/xhtml2/ |
XHTML is an XML app, while HTML is a SGML app.
SGML XML
| |
+--------+-----+ +--------+------+------+
| | | | | | |
DocBook TEI HTML ... XHTML MathML SVG SMIL ...
Because SGML admits optional start and end tags, SGML documents require a DTD. You can't really mix SGML documents with different DTDs. HTML can't be extended or mixed with other markup (say, for graphics, math, etc.).
XML was created to (1) get rid of zillions of special features of SGML that were either never used, made a DTD required, or would confuse a processing agent, and (2) allow easy mixing and extensions (namespaces and modules).
Here is a simple well-formed XHTML document, that conforms to the XHTML 1.0 Strict DTD:
<html> <head> <title>Classic</title> </head> <body> <p>Hello, World</p> </body> </html>
If you want a valid document, you must include a doctype declaration. The XHTML definition includes a notion of strictly conforming documents which goes a little beyond validation.
<?xml version="1.0" charset="utf-8"?>
<!DOCTYPE html
PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/XHTML1/DTD/strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<title>Hello</title>
</head>
<body>
<h1>Hi</h1>
<p>This is my <a href="fido.html"> dog</a>.
<img src="fido.jpg" alt="fido" /></p>
</body>
</html>
This diagram shows all the elements of XHTML 1.0 Strict, and shows which elements may be children of which.
You can also see a page with a short description of each element.
Besides reading the official specs, you'll want to get good at authoring XHTML documents.
Many tools know how to render HTML, but do a poor job with XML. So there are a number of things you should do while writing XHTML to maximize the chance your documents will look good on these systems. These things are described in Appendix C of the official definition of XHTML 1.0.
Some of the more interesting issues you have to put up with in moving to XHTML are:
Getting an XHTML document to render properly on both XML-aware and HTML-only user agents requires you do a few unfortunate things, like leaving out processing instructions or doubling up on information you should only have to specify once. Details in the w3.org specs.
<!-- ========================================================================
=
= XHTML 1.0 Strict DTD
=
= Namespace = http://www.w3.org/1999/xhtml
=
= For further information, see: http://www.w3.org/TR/xhtml1
=
= Copyright (c) 1998-2002 W3C (MIT, INRIA, Keio),
= All Rights Reserved.
=
= This DTD module is identified by the PUBLIC and SYSTEM identifiers:
=
= PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
= SYSTEM "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"
=
========================================================================= -->
<!--================ Character mnemonic entities =========================-->
<!ENTITY % HTMLlat1
PUBLIC "-//W3C//ENTITIES Latin 1 for XHTML//EN"
"xhtml-lat1.ent">
%HTMLlat1;
<!ENTITY % HTMLsymbol
PUBLIC "-//W3C//ENTITIES Symbols for XHTML//EN"
"xhtml-symbol.ent">
%HTMLsymbol;
<!ENTITY % HTMLspecial
PUBLIC "-//W3C//ENTITIES Special for XHTML//EN"
"xhtml-special.ent">
%HTMLspecial;
<!--================== Imported Names ====================================-->
<!ENTITY % ContentType "CDATA"> <!-- media type per RFC2045 -->
<!ENTITY % ContentTypes "CDATA"> <!-- comma-separated media types -->
<!ENTITY % Charset "CDATA"> <!-- char encoding per RFC2045 -->
<!ENTITY % Charsets "CDATA"> <!-- space separated char encs -->
<!ENTITY % LanguageCode "NMTOKEN"> <!-- language code per RFC3066 -->
<!ENTITY % Character "CDATA"> <!-- single XML character -->
<!ENTITY % Number "CDATA"> <!-- one or more digits -->
<!ENTITY % LinkTypes "CDATA"> <!-- space-separated link types -->
<!ENTITY % MediaDesc "CDATA"> <!-- single or comma-separated -->
<!-- list of media descriptors -->
<!-- (screen, tty, tv, handheld, -->
<!-- projection, print, braille, -->
<!-- aural, emboss, all) -->
<!ENTITY % URI "CDATA"> <!-- URI, see RFC2396 -->
<!ENTITY % UriList "CDATA"> <!-- space separated URIs -->
<!ENTITY % Datetime "CDATA"> <!-- date and time in ISO format -->
<!ENTITY % Script "CDATA"> <!-- script expression -->
<!ENTITY % StyleSheet "CDATA"> <!-- style sheet data -->
<!ENTITY % Text "CDATA"> <!-- "human readable" -->
<!ENTITY % Length "CDATA"> <!-- n for pixels n% for percent -->
<!ENTITY % MultiLength "CDATA"> <!-- pixel, percent, or relative -->
<!ENTITY % Pixels "CDATA"> <!-- integer length in pixels -->
<!ENTITY % Shape "(rect|circle|poly|default)">
<!ENTITY % Coords "CDATA"> <!-- comma separated lengths -->
<!--=================== Generic Attributes ===============================-->
<!-- core attributes common to most elements
id document-wide unique id
class space separated list of classes
style associated style info
title advisory title/amplification -->
<!ENTITY % coreattrs
"id ID #IMPLIED
class CDATA #IMPLIED
style %StyleSheet; #IMPLIED
title %Text; #IMPLIED">
<!-- internationalization attributes
lang language code (backwards compatible)
xml:lang language code (as per XML 1.0 spec)
dir direction for weak/neutral text -->
<!ENTITY % i18n
"lang %LanguageCode; #IMPLIED
xml:lang %LanguageCode; #IMPLIED
dir (ltr|rtl) #IMPLIED">
<!-- attributes for common UI events
onclick a pointer button was clicked
ondblclick a pointer button was double clicked
onmousedown a pointer button was pressed down
onmouseup a pointer button was released
onmousemove a pointer was moved onto the element
onmouseout a pointer was moved away from the element
onkeypress a key was pressed and released
onkeydown a key was pressed down
onkeyup a key was released -->
<!ENTITY % events
"onclick %Script; #IMPLIED
ondblclick %Script; #IMPLIED
onmousedown %Script; #IMPLIED
onmouseup %Script; #IMPLIED
onmouseover %Script; #IMPLIED
onmousemove %Script; #IMPLIED
onmouseout %Script; #IMPLIED
onkeypress %Script; #IMPLIED
onkeydown %Script; #IMPLIED
onkeyup %Script; #IMPLIED">
<!-- attributes for elements that can get the focus
accesskey accessibility key character
tabindex position in tabbing order
onfocus the element got the focus
onblur the element lost the focus -->
<!ENTITY % focus
"accesskey %Character; #IMPLIED
tabindex %Number; #IMPLIED
onfocus %Script; #IMPLIED
onblur %Script; #IMPLIED">
<!ENTITY % attrs "%coreattrs; %i18n; %events;">
<!--=================== Text (Inline) Elements ===========================-->
<!ENTITY % special.pre "br | span | bdo | map">
<!ENTITY % special "%special.pre; | object | img">
<!ENTITY % fontstyle "tt | i | b | big | small">
<!ENTITY % phrase "em | strong | dfn | code | q | samp | kbd | var
| cite | abbr | acronym | sub | sup ">
<!ENTITY % inline.forms "input | select | textarea | label | button">
<!ENTITY % misc.inline "ins | del | script">
<!ENTITY % inline "a | %special; | %fontstyle; | %phrase; | %inline.forms;">
<!ENTITY % Inline "(#PCDATA | %inline; | %misc.inline;)*">
<!--================== Block level elements ==============================-->
<!ENTITY % heading "h1 | h2 | h3 | h4 | h5 | h6">
<!ENTITY % lists "ul | ol | dl">
<!ENTITY % blocktext "pre | hr | blockquote | address">
<!ENTITY % misc "noscript | %misc.inline;">
<!ENTITY % block
"p | %heading; | div | %lists; | %blocktext; | fieldset | table">
<!ENTITY % Block "(%block; | form | %misc;)*">
<!--================== "Flow" elements ===================================-->
<!-- %Flow; mixes block and inline and is used for list items etc. -->
<!ENTITY % Flow "(#PCDATA | %block; | form | %inline; | %misc;)*">
<!--================ Document Structure ==================================-->
<!ELEMENT html (head, body)>
<!ATTLIST html
%i18n;
id ID #IMPLIED
xmlns %URI; #FIXED 'http://www.w3.org/1999/xhtml'>
<!--================ Document Head =======================================-->
<!ENTITY % head.misc "(script | style | meta | link | object)*">
<!-- content model is %head.misc; combined with a single
title and an optional base element in any order -->
<!ELEMENT head (%head.misc;,
((title, %head.misc;, (base, %head.misc;)?) |
(base, %head.misc;, (title, %head.misc;))))>
<!ATTLIST head
%i18n;
id ID #IMPLIED
profile %URI; #IMPLIED>
<!ELEMENT title (#PCDATA)> <!-- document title -->
<!ATTLIST title
%i18n;
id ID #IMPLIED>
<!ELEMENT base EMPTY> <!-- document base URI -->
<!ATTLIST base
href %URI; #REQUIRED
id ID #IMPLIED>
<!ELEMENT meta EMPTY> <!-- generic metainformation -->
<!ATTLIST meta
%i18n;
id ID #IMPLIED
http-equiv CDATA #IMPLIED
name CDATA #IMPLIED
content CDATA #REQUIRED
scheme CDATA #IMPLIED>
<!-- Relationship values can be used in principle:
a) for document specific toolbars/menus when used
with the link element in document head e.g.
start, contents, previous, next, index, end, help
b) to link to a separate style sheet (rel="stylesheet")
c) to make a link to a script (rel="script")
d) by stylesheets to control how collections of
html nodes are rendered into printed documents
e) to make a link to a printable version of this document
e.g. a PostScript or PDF version (rel="alternate" media="print") -->
<!ELEMENT link EMPTY>
<!ATTLIST link
%attrs;
charset %Charset; #IMPLIED
href %URI; #IMPLIED
hreflang %LanguageCode; #IMPLIED
type %ContentType; #IMPLIED
rel %LinkTypes; #IMPLIED
rev %LinkTypes; #IMPLIED
media %MediaDesc; #IMPLIED>
<!ELEMENT style (#PCDATA)> <!-- Stylesheet statements -->
<!ATTLIST style
%i18n;
id ID #IMPLIED
type %ContentType; #REQUIRED
media %MediaDesc; #IMPLIED
title %Text; #IMPLIED
xml:space (preserve) #FIXED 'preserve'>
<!ELEMENT script (#PCDATA)> <!-- Script statements -->
<!ATTLIST script
id ID #IMPLIED
charset %Charset; #IMPLIED
type %ContentType; #REQUIRED
src %URI; #IMPLIED
defer (defer) #IMPLIED
xml:space (preserve) #FIXED 'preserve'>
<!-- alternate content container for non script-based rendering -->
<!ELEMENT noscript %Block;>
<!ATTLIST noscript %attrs;>
<!--=================== Document Body ====================================-->
<!ELEMENT body %Block;>
<!ATTLIST body
%attrs;
onload %Script; #IMPLIED
onunload %Script; #IMPLIED>
<!--=================== Divisions ========================================-->
<!ELEMENT div %Flow;>
<!ATTLIST div %attrs;>
<!--=================== Paragraphs =======================================-->
<!ELEMENT p %Inline;>
<!ATTLIST p %attrs;>
<!--=================== Headings =========================================-->
<!ELEMENT h1 %Inline;>
<!ATTLIST h1 %attrs;>
<!ELEMENT h2 %Inline;>
<!ATTLIST h2 %attrs;>
<!ELEMENT h3 %Inline;>
<!ATTLIST h3 %attrs;>
<!ELEMENT h4 %Inline;>
<!ATTLIST h4 %attrs;>
<!ELEMENT h5 %Inline;>
<!ATTLIST h5 %attrs;>
<!ELEMENT h6 %Inline;>
<!ATTLIST h6 %attrs;>
<!--=================== Lists ============================================-->
<!ELEMENT ul (li)+> <!-- Unordered list -->
<!ATTLIST ul %attrs;>
<!ELEMENT ol (li)+> <!-- Ordered (numbered) list -->
<!ATTLIST ol %attrs;>
<!ELEMENT li %Flow;> <!-- list item for ul and ol -->
<!ATTLIST li %attrs;>
<!ELEMENT dl (dt|dd)+> <!-- definition list -->
<!ATTLIST dl %attrs;>
<!ELEMENT dt %Inline;> <!-- definition term -->
<!ATTLIST dt %attrs;>
<!ELEMENT dd %Flow;> <!-- definition or the term -->
<!ATTLIST dd %attrs;>
<!--=================== Address ==========================================-->
<!ELEMENT address %Inline;> <!-- information on author -->
<!ATTLIST address %attrs;>
<!--=================== Horizontal Rule ==================================-->
<!ELEMENT hr EMPTY>
<!ATTLIST hr %attrs;>
<!--=================== Preformatted Text ================================-->
<!-- pre content is %Inline; excluding "img|object|big|small|sub|sup" -->
<!ENTITY % pre.content
"(#PCDATA | a | %fontstyle; | %phrase; | %special.pre; | %misc.inline;
| %inline.forms;)*">
<!ELEMENT pre %pre.content;>
<!ATTLIST pre
%attrs;
xml:space (preserve) #FIXED 'preserve'>
<!--=================== Block-like Quotes ================================-->
<!ELEMENT blockquote %Block;>
<!ATTLIST blockquote
%attrs;
cite %URI; #IMPLIED>
<!--=================== Inserted/Deleted Text ============================-->
<!-- ins/del are allowed in block and inline content, but its
inappropriate to include block content within an ins element
occurring in inline content. -->
<!ELEMENT ins %Flow;>
<!ATTLIST ins
%attrs;
cite %URI; #IMPLIED
datetime %Datetime; #IMPLIED>
<!ELEMENT del %Flow;>
<!ATTLIST del
%attrs;
cite %URI; #IMPLIED
datetime %Datetime; #IMPLIED>
<!--================== The Anchor Element ================================-->
<!-- a is like %Inline; except that anchors shouldn't be nested -->
<!ENTITY % a.content
"(#PCDATA | %special; | %fontstyle; | %phrase; | %inline.forms;
| %misc.inline;)*">
<!ELEMENT a %a.content;>
<!ATTLIST a
%attrs;
%focus;
charset %Charset; #IMPLIED
type %ContentType; #IMPLIED
name NMTOKEN #IMPLIED
href %URI; #IMPLIED
hreflang %LanguageCode; #IMPLIED
rel %LinkTypes; #IMPLIED
rev %LinkTypes; #IMPLIED
shape %Shape; "rect"
coords %Coords; #IMPLIED>
<!--===================== Inline Elements ================================-->
<!ELEMENT span %Inline;>
<!ATTLIST span %attrs;>
<!ELEMENT bdo %Inline;> <!-- I18N BiDi over-ride -->
<!ATTLIST bdo
%coreattrs;
%events;
lang %LanguageCode; #IMPLIED
xml:lang %LanguageCode; #IMPLIED
dir (ltr|rtl) #REQUIRED>
<!ELEMENT br EMPTY> <!-- forced line break -->
<!ATTLIST br %coreattrs;>
<!ELEMENT em %Inline;> <!-- emphasis -->
<!ATTLIST em %attrs;>
<!ELEMENT strong %Inline;> <!-- strong emphasis -->
<!ATTLIST strong %attrs;>
<!ELEMENT dfn %Inline;> <!-- definitional -->
<!ATTLIST dfn %attrs;>
<!ELEMENT code %Inline;> <!-- program code -->
<!ATTLIST code %attrs;>
<!ELEMENT samp %Inline;> <!-- sample -->
<!ATTLIST samp %attrs;>
<!ELEMENT kbd %Inline;> <!-- something user would type -->
<!ATTLIST kbd %attrs;>
<!ELEMENT var %Inline;> <!-- variable -->
<!ATTLIST var %attrs;>
<!ELEMENT cite %Inline;> <!-- citation -->
<!ATTLIST cite %attrs;>
<!ELEMENT abbr %Inline;> <!-- abbreviation -->
<!ATTLIST abbr %attrs;>
<!ELEMENT acronym %Inline;> <!-- acronym -->
<!ATTLIST acronym %attrs;>
<!ELEMENT q %Inline;> <!-- inlined quote -->
<!ATTLIST q
%attrs;
cite %URI; #IMPLIED>
<!ELEMENT sub %Inline;> <!-- subscript -->
<!ATTLIST sub %attrs;>
<!ELEMENT sup %Inline;> <!-- superscript -->
<!ATTLIST sup %attrs;>
<!ELEMENT tt %Inline;> <!-- fixed pitch font -->
<!ATTLIST tt %attrs;>
<!ELEMENT i %Inline;> <!-- italic font -->
<!ATTLIST i %attrs;>
<!ELEMENT b %Inline;> <!-- bold font -->
<!ATTLIST b %attrs;>
<!ELEMENT big %Inline;> <!-- bigger font -->
<!ATTLIST big %attrs;>
<!ELEMENT small %Inline;> <!-- smaller font -->
<!ATTLIST small %attrs;>
<!--==================== Object ==========================================-->
<!-- object is used to embed objects as part of XHTML pages.
param elements should precede other content. Parameters
can also be expressed as attribute/value pairs on the
object element itself when brevity is desired. -->
<!ELEMENT object (#PCDATA | param | %block; | form | %inline; | %misc;)*>
<!ATTLIST object
%attrs;
declare (declare) #IMPLIED
classid %URI; #IMPLIED
codebase %URI; #IMPLIED
data %URI; #IMPLIED
type %ContentType; #IMPLIED
codetype %ContentType; #IMPLIED
archive %UriList; #IMPLIED
standby %Text; #IMPLIED
height %Length; #IMPLIED
width %Length; #IMPLIED
usemap %URI; #IMPLIED
name NMTOKEN #IMPLIED
tabindex %Number; #IMPLIED>
<!-- param is used to supply a named property value.
In XML it would seem natural to follow RDF and support an
abbreviated syntax where the param elements are replaced
by attribute value pairs on the object start tag. -->
<!ELEMENT param EMPTY>
<!ATTLIST param
id ID #IMPLIED
name CDATA #IMPLIED
value CDATA #IMPLIED
valuetype (data|ref|object) "data"
type %ContentType; #IMPLIED>
<!--=================== Images ===========================================-->
<!ELEMENT img EMPTY>
<!ATTLIST img
%attrs;
src %URI; #REQUIRED
alt %Text; #REQUIRED
longdesc %URI; #IMPLIED
height %Length; #IMPLIED
width %Length; #IMPLIED
usemap %URI; #IMPLIED
ismap (ismap) #IMPLIED>
<!-- usemap points to a map element which may be in this document
or an external document, although the latter is not widely supported -->
<!--================== Client-side image maps ============================-->
<!-- These can be placed in the same document or grouped in a
separate document although this isn't yet widely supported -->
<!ELEMENT map ((%block; | form | %misc;)+ | area+)>
<!ATTLIST map
%i18n;
%events;
id ID #REQUIRED
class CDATA #IMPLIED
style %StyleSheet; #IMPLIED
title %Text; #IMPLIED
name NMTOKEN #IMPLIED>
<!ELEMENT area EMPTY>
<!ATTLIST area
%attrs;
%focus;
shape %Shape; "rect"
coords %Coords; #IMPLIED
href %URI; #IMPLIED
nohref (nohref) #IMPLIED
alt %Text; #REQUIRED>
<!--================ Forms ===============================================-->
<!-- form uses %Block; excluding form -->
<!ENTITY % form.content "(%block; | %misc;)*">
<!ELEMENT form %form.content;>
<!ATTLIST form
%attrs;
action %URI; #REQUIRED
method (get|post) "get"
enctype %ContentType; "application/x-www-form-urlencoded"
onsubmit %Script; #IMPLIED
onreset %Script; #IMPLIED
accept %ContentTypes; #IMPLIED
accept-charset %Charsets; #IMPLIED>
<!-- Each label must not contain more than ONE field.
Label elements shouldn't be nested. -->
<!ELEMENT label %Inline;>
<!ATTLIST label
%attrs;
for IDREF #IMPLIED
accesskey %Character; #IMPLIED
onfocus %Script; #IMPLIED
onblur %Script; #IMPLIED>
<!ENTITY % InputType
"(text | password | checkbox | radio | submit | reset |
file | hidden | image | button)">
<!-- The name attribute is required for all but submit & reset -->
<!ELEMENT input EMPTY>
<!ATTLIST input
%attrs;
%focus;
type %InputType; "text"
name CDATA #IMPLIED
value CDATA #IMPLIED
checked (checked) #IMPLIED
disabled (disabled) #IMPLIED
readonly (readonly) #IMPLIED
size CDATA #IMPLIED
maxlength %Number; #IMPLIED
src %URI; #IMPLIED
alt CDATA #IMPLIED
usemap %URI; #IMPLIED
onselect %Script; #IMPLIED
onchange %Script; #IMPLIED
accept %ContentTypes; #IMPLIED>
<!ELEMENT select (optgroup|option)+> <!-- option selector -->
<!ATTLIST select
%attrs;
name CDATA #IMPLIED
size %Number; #IMPLIED
multiple (multiple) #IMPLIED
disabled (disabled) #IMPLIED
tabindex %Number; #IMPLIED
onfocus %Script; #IMPLIED
onblur %Script; #IMPLIED
onchange %Script; #IMPLIED>
<!ELEMENT optgroup (option)+> <!-- option group -->
<!ATTLIST optgroup
%attrs;
disabled (disabled) #IMPLIED
label %Text; #REQUIRED>
<!ELEMENT option (#PCDATA)> <!-- selectable choice -->
<!ATTLIST option
%attrs;
selected (selected) #IMPLIED
disabled (disabled) #IMPLIED
label %Text; #IMPLIED
value CDATA #IMPLIED>
<!ELEMENT textarea (#PCDATA)> <!-- multi-line text field -->
<!ATTLIST textarea
%attrs;
%focus;
name CDATA #IMPLIED
rows %Number; #REQUIRED
cols %Number; #REQUIRED
disabled (disabled) #IMPLIED
readonly (readonly) #IMPLIED
onselect %Script; #IMPLIED
onchange %Script; #IMPLIED>
<!-- The fieldset element is used to group form fields.
Only one legend element should occur in the content
and if present should only be preceded by whitespace. -->
<!ELEMENT fieldset (#PCDATA | legend | %block; | form | %inline; | %misc;)*>
<!ATTLIST fieldset %attrs;>
<!ELEMENT legend %Inline;> <!-- fieldset label -->
<!ATTLIST legend
%attrs;
accesskey %Character; #IMPLIED>
<!-- button uses %Flow; but excludes a, form and form controls -->
<!ENTITY % button.content
"(#PCDATA | p | %heading; | div | %lists; | %blocktext; |
table | %special; | %fontstyle; | %phrase; | %misc;)*">
<!ELEMENT button %button.content;> <!-- push button -->
<!ATTLIST button
%attrs;
%focus;
name CDATA #IMPLIED
value CDATA #IMPLIED
type (button|submit|reset) "submit"
disabled (disabled) #IMPLIED>
<!--======================= Tables =======================================-->
<!-- The border attribute sets the thickness of the frame around the
table. The default units are screen pixels. -->
<!-- The frame attribute specifies which parts of the frame around
the table should be rendered. -->
<!ENTITY % TFrame "(void|above|below|hsides|lhs|rhs|vsides|box|border)">
<!-- The rules attribute defines which rules to draw between cells:
If rules is absent then assume "none" if border is absent or
border="0" otherwise "all" -->
<!ENTITY % TRules "(none | groups | rows | cols | all)">
<!-- horizontal alignment attributes for cell contents
char alignment char, e.g. char=':'
charoff offset for alignment char -->
<!ENTITY % cellhalign
"align (left|center|right|justify|char) #IMPLIED
char %Character; #IMPLIED
charoff %Length; #IMPLIED">
<!-- vertical alignment attributes for cell contents -->
<!ENTITY % cellvalign
"valign (top|middle|bottom|baseline) #IMPLIED">
<!ELEMENT table
(caption?, (col*|colgroup*), thead?, tfoot?, (tbody+|tr+))>
<!ELEMENT caption %Inline;>
<!ELEMENT thead (tr)+>
<!ELEMENT tfoot (tr)+>
<!ELEMENT tbody (tr)+>
<!ELEMENT colgroup (col)*>
<!ELEMENT col EMPTY>
<!ELEMENT tr (th|td)+>
<!ELEMENT th %Flow;>
<!ELEMENT td %Flow;>
<!ATTLIST table
%attrs;
summary %Text; #IMPLIED
width %Length; #IMPLIED
border %Pixels; #IMPLIED
frame %TFrame; #IMPLIED
rules %TRules; #IMPLIED
cellspacing %Length; #IMPLIED
cellpadding %Length; #IMPLIED>
<!ATTLIST caption %attrs;>
<!-- colgroup groups a set of col elements. It allows you to group
several semantically related columns together. -->
<!ATTLIST colgroup
%attrs;
span %Number; "1"
width %MultiLength; #IMPLIED
%cellhalign;
%cellvalign;>
<!-- col elements define the alignment properties for cells in
one or more columns. The width attribute specifies the width of
the columns, e.g.
width=64 width in screen pixels
width=0.5* relative width of 0.5
The span attribute causes the attributes of one
col element to apply to more than one column. -->
<!ATTLIST col
%attrs;
span %Number; "1"
width %MultiLength; #IMPLIED
%cellhalign;
%cellvalign;>
<!-- Use thead to duplicate headers when breaking table
across page boundaries, or for static headers when
tbody sections are rendered in scrolling panel.
Use tfoot to duplicate footers when breaking table
across page boundaries, or for static footers when
tbody sections are rendered in scrolling panel.
Use multiple tbody sections when rules are needed
between groups of table rows. -->
<!ATTLIST thead
%attrs;
%cellhalign;
%cellvalign;>
<!ATTLIST tfoot
%attrs;
%cellhalign;
%cellvalign;>
<!ATTLIST tbody
%attrs;
%cellhalign;
%cellvalign;>
<!ATTLIST tr
%attrs;
%cellhalign;
%cellvalign;>
<!-- Scope is simpler than headers attribute for common tables -->
<!ENTITY % Scope "(row|col|rowgroup|colgroup)">
<!-- th is for headers, td for data and for cells acting as both -->
<!ATTLIST th
%attrs;
abbr %Text; #IMPLIED
axis CDATA #IMPLIED
headers IDREFS #IMPLIED
scope %Scope; #IMPLIED
rowspan %Number; "1"
colspan %Number; "1"
%cellhalign;
%cellvalign;>
<!ATTLIST td
%attrs;
abbr %Text; #IMPLIED
axis CDATA #IMPLIED
headers IDREFS #IMPLIED
scope %Scope; #IMPLIED
rowspan %Number; "1"
colspan %Number; "1"
%cellhalign;
%cellvalign;>
Well, I simplified things a little. The XHTML DTD references three external entities, but these contain a bunch of entity declarations, and those are what are here:
<!ENTITY quot """> <!ENTITY amp "&#38;"> <!ENTITY lt "&#60;"> <!ENTITY gt ">"> <!ENTITY apos "'"> <!ENTITY nbsp " "> <!ENTITY iexcl "¡"> <!ENTITY cent "¢"> <!ENTITY pound "£"> <!ENTITY curren "¤"> <!ENTITY yen "¥"> <!ENTITY brvbar "¦"> <!ENTITY sect "§"> <!ENTITY uml "¨"> <!ENTITY copy "©"> <!ENTITY ordf "ª"> <!ENTITY laquo "«"> <!ENTITY not "¬"> <!ENTITY shy "­"> <!ENTITY reg "®"> <!ENTITY macr "¯"> <!ENTITY deg "°"> <!ENTITY plusmn "±"> <!ENTITY sup2 "²"> <!ENTITY sup3 "³"> <!ENTITY acute "´"> <!ENTITY micro "µ"> <!ENTITY para "¶"> <!ENTITY middot "·"> <!ENTITY cedil "¸"> <!ENTITY sup1 "¹"> <!ENTITY ordm "º"> <!ENTITY raquo "»"> <!ENTITY frac14 "¼"> <!ENTITY frac12 "½"> <!ENTITY frac34 "¾"> <!ENTITY iquest "¿"> <!ENTITY Agrave "À"> <!ENTITY Aacute "Á"> <!ENTITY Acirc "Â"> <!ENTITY Atilde "Ã"> <!ENTITY Auml "Ä"> <!ENTITY Aring "Å"> <!ENTITY AElig "Æ"> <!ENTITY Ccedil "Ç"> <!ENTITY Egrave "È"> <!ENTITY Eacute "É"> <!ENTITY Ecirc "Ê"> <!ENTITY Euml "Ë"> <!ENTITY Igrave "Ì"> <!ENTITY Iacute "Í"> <!ENTITY Icirc "Î"> <!ENTITY Iuml "Ï"> <!ENTITY ETH "Ð"> <!ENTITY Ntilde "Ñ"> <!ENTITY Ograve "Ò"> <!ENTITY Oacute "Ó"> <!ENTITY Ocirc "Ô"> <!ENTITY Otilde "Õ"> <!ENTITY Ouml "Ö"> <!ENTITY times "×"> <!ENTITY Oslash "Ø"> <!ENTITY Ugrave "Ù"> <!ENTITY Uacute "Ú"> <!ENTITY Ucirc "Û"> <!ENTITY Uuml "Ü"> <!ENTITY Yacute "Ý"> <!ENTITY THORN "Þ"> <!ENTITY szlig "ß"> <!ENTITY agrave "à"> <!ENTITY aacute "á"> <!ENTITY acirc "â"> <!ENTITY atilde "ã"> <!ENTITY auml "ä"> <!ENTITY aring "å"> <!ENTITY aelig "æ"> <!ENTITY ccedil "ç"> <!ENTITY egrave "è"> <!ENTITY eacute "é"> <!ENTITY ecirc "ê"> <!ENTITY euml "ë"> <!ENTITY igrave "ì"> <!ENTITY iacute "í"> <!ENTITY icirc "î"> <!ENTITY iuml "ï"> <!ENTITY eth "ð"> <!ENTITY ntilde "ñ"> <!ENTITY ograve "ò"> <!ENTITY oacute "ó"> <!ENTITY ocirc "ô"> <!ENTITY otilde "õ"> <!ENTITY ouml "ö"> <!ENTITY divide "÷"> <!ENTITY oslash "ø"> <!ENTITY ugrave "ù"> <!ENTITY uacute "ú"> <!ENTITY ucirc "û"> <!ENTITY uuml "ü"> <!ENTITY yacute "ý"> <!ENTITY thorn "þ"> <!ENTITY yuml "ÿ"> <!ENTITY OElig "Œ"> <!ENTITY oelig "œ"> <!ENTITY Scaron "Š"> <!ENTITY scaron "š"> <!ENTITY Yuml "Ÿ"> <!ENTITY circ "ˆ"> <!ENTITY tilde "˜"> <!ENTITY ensp " "> <!ENTITY emsp " "> <!ENTITY thinsp " "> <!ENTITY zwnj "‌"> <!ENTITY zwj "‍"> <!ENTITY lrm "‎"> <!ENTITY rlm "‏"> <!ENTITY ndash "–"> <!ENTITY mdash "—"> <!ENTITY lsquo "‘"> <!ENTITY rsquo "’"> <!ENTITY sbquo "‚"> <!ENTITY ldquo "“"> <!ENTITY rdquo "”"> <!ENTITY bdquo "„"> <!ENTITY dagger "†"> <!ENTITY Dagger "‡"> <!ENTITY permil "‰"> <!ENTITY lsaquo "‹"> <!ENTITY rsaquo "›"> <!ENTITY euro "€"> <!ENTITY fnof "ƒ"> <!ENTITY Alpha "Α"> <!ENTITY Beta "Β"> <!ENTITY Gamma "Γ"> <!ENTITY Delta "Δ"> <!ENTITY Epsilon "Ε"> <!ENTITY Zeta "Ζ"> <!ENTITY Eta "Η"> <!ENTITY Theta "Θ"> <!ENTITY Iota "Ι"> <!ENTITY Kappa "Κ"> <!ENTITY Lambda "Λ"> <!ENTITY Mu "Μ"> <!ENTITY Nu "Ν"> <!ENTITY Xi "Ξ"> <!ENTITY Omicron "Ο"> <!ENTITY Pi "Π"> <!ENTITY Rho "Ρ"> <!ENTITY Sigma "Σ"> <!ENTITY Tau "Τ"> <!ENTITY Upsilon "Υ"> <!ENTITY Phi "Φ"> <!ENTITY Chi "Χ"> <!ENTITY Psi "Ψ"> <!ENTITY Omega "Ω"> <!ENTITY alpha "α"> <!ENTITY beta "β"> <!ENTITY gamma "γ"> <!ENTITY delta "δ"> <!ENTITY epsilon "ε"> <!ENTITY zeta "ζ"> <!ENTITY eta "η"> <!ENTITY theta "θ"> <!ENTITY iota "ι"> <!ENTITY kappa "κ"> <!ENTITY lambda "λ"> <!ENTITY mu "μ"> <!ENTITY nu "ν"> <!ENTITY xi "ξ"> <!ENTITY omicron "ο"> <!ENTITY pi "π"> <!ENTITY rho "ρ"> <!ENTITY sigmaf "ς"> <!ENTITY sigma "σ"> <!ENTITY tau "τ"> <!ENTITY upsilon "υ"> <!ENTITY phi "φ"> <!ENTITY chi "χ"> <!ENTITY psi "ψ"> <!ENTITY omega "ω"> <!ENTITY thetasym "ϑ"> <!ENTITY upsih "ϒ"> <!ENTITY piv "ϖ"> <!ENTITY bull "•"> <!ENTITY hellip "…"> <!ENTITY prime "′"> <!ENTITY Prime "″"> <!ENTITY oline "‾"> <!ENTITY frasl "⁄"> <!ENTITY weierp "℘"> <!ENTITY image "ℑ"> <!ENTITY real "ℜ"> <!ENTITY trade "™"> <!ENTITY alefsym "ℵ"> <!ENTITY larr "←"> <!ENTITY uarr "↑"> <!ENTITY rarr "→"> <!ENTITY darr "↓"> <!ENTITY harr "↔"> <!ENTITY crarr "↵"> <!ENTITY lArr "⇐"> <!ENTITY uArr "⇑"> <!ENTITY rArr "⇒"> <!ENTITY dArr "⇓"> <!ENTITY hArr "⇔"> <!ENTITY forall "∀"> <!ENTITY part "∂"> <!ENTITY exist "∃"> <!ENTITY empty "∅"> <!ENTITY nabla "∇"> <!ENTITY isin "∈"> <!ENTITY notin "∉"> <!ENTITY ni "∋"> <!ENTITY prod "∏"> <!ENTITY sum "∑"> <!ENTITY minus "−"> <!ENTITY lowast "∗"> <!ENTITY radic "√"> <!ENTITY prop "∝"> <!ENTITY infin "∞"> <!ENTITY ang "∠"> <!ENTITY and "∧"> <!ENTITY or "∨"> <!ENTITY cap "∩"> <!ENTITY cup "∪"> <!ENTITY int "∫"> <!ENTITY there4 "∴"> <!ENTITY sim "∼"> <!ENTITY cong "≅"> <!ENTITY asymp "≈"> <!ENTITY ne "≠"> <!ENTITY equiv "≡"> <!ENTITY le "≤"> <!ENTITY ge "≥"> <!ENTITY sub "⊂"> <!ENTITY sup "⊃"> <!ENTITY nsub "⊄"> <!ENTITY sube "⊆"> <!ENTITY supe "⊇"> <!ENTITY oplus "⊕"> <!ENTITY otimes "⊗"> <!ENTITY perp "⊥"> <!ENTITY sdot "⋅"> <!ENTITY lceil "⌈"> <!ENTITY rceil "⌉"> <!ENTITY lfloor "⌊"> <!ENTITY rfloor "⌋"> <!ENTITY lang "〈"> <!ENTITY rang "〉"> <!ENTITY loz "◊"> <!ENTITY spades "♠"> <!ENTITY clubs "♣"> <!ENTITY hearts "♥"> <!ENTITY diams "♦">
Some skills you need