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XHTML 1.0 (Second Edition) Strict in XML Schema
This is the same as HTML 4 Strict except for
changes due to the differences between XML and SGML.
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.
The DTD version 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"
$Id: xhtml1-strict.xsd,v 1.2 2002/08/28 08:05:44 mimasa Exp $
================ Character mnemonic entities =========================
XHTML entity sets are identified by the PUBLIC and SYSTEM identifiers:
PUBLIC "-//W3C//ENTITIES Latin 1 for XHTML//EN"
SYSTEM "http://www.w3.org/TR/xhtml1/DTD/xhtml-lat1.ent"
PUBLIC "-//W3C//ENTITIES Special for XHTML//EN"
SYSTEM "http://www.w3.org/TR/xhtml1/DTD/xhtml-special.ent"
PUBLIC "-//W3C//ENTITIES Symbols for XHTML//EN"
SYSTEM "http://www.w3.org/TR/xhtml1/DTD/xhtml-symbol.ent"
================== Imported Names ====================================
media type, as per [RFC2045]
comma-separated list of media types, as per [RFC2045]
a character encoding, as per [RFC2045]
a space separated list of character encodings, as per [RFC2045]
a language code, as per [RFC3066]
a single character, as per section 2.2 of [XML]
one or more digits
tabindex attribute specifies the position of the current element
in the tabbing order for the current document. This value must be
a number between 0 and 32767. User agents should ignore leading zeros.
space-separated list of link types
single or comma-separated list of media descriptors
a Uniform Resource Identifier, see [RFC2396]
a space separated list of Uniform Resource Identifiers
date and time information. ISO date format
script expression
style sheet data
used for titles etc.
nn for pixels or nn% for percentage length
pixel, percentage, or relative
integer representing length in pixels
these are used for image maps
comma separated list of 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
internationalization attributes
lang language code (backwards compatible)
xml:lang language code (as per XML 1.0 spec)
dir direction for weak/neutral text
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
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
=================== Text Elements ====================================
these can only occur at block level
"Inline" covers inline or "text-level" elements
================== Block level elements ==============================
"Flow" mixes block and inline and is used for list items etc.
================== Content models for exclusions =====================
a elements use "Inline" excluding a
pre uses "Inline" excluding big, small, sup or sup
form uses "Block" excluding form
button uses "Flow" but excludes a, form and form controls
================ Document Structure ==================================
================ Document Head =======================================
content model is "head.misc" combined with a single
title and an optional base element in any order
The title element is not considered part of the flow of text.
It should be displayed, for example as the page header or
window title. Exactly one title is required per document.
document base URI
generic metainformation
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")
style info, which may include CDATA sections
script statements, which may include CDATA sections
alternate content container for non script-based rendering
=================== Document Body ====================================
generic language/style container
=================== Paragraphs =======================================
=================== Headings =========================================
There are six levels of headings from h1 (the most important)
to h6 (the least important).
=================== Lists ============================================
Unordered list
Ordered (numbered) list
list item
definition lists - dt for term, dd for its definition
=================== Address ==========================================
information on author
=================== Horizontal Rule ==================================
=================== Preformatted Text ================================
content is "Inline" excluding "img|object|big|small|sub|sup"
=================== Block-like Quotes ================================
=================== 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.
================== The Anchor Element ================================
content is "Inline" except that anchors shouldn't be nested
===================== Inline Elements ================================
generic language/style container
I18N BiDi over-ride
forced line break
emphasis
strong emphasis
definitional
program code
sample
something user would type
variable
citation
abbreviation
acronym
inlined quote
subscript
superscript
fixed pitch font
italic font
bold font
bigger font
smaller font
==================== Object ======================================
object is used to embed objects as part of HTML 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.
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.
=================== Images ===========================================
To avoid accessibility problems for people who aren't
able to see the image, you should provide a text
description using the alt and longdesc attributes.
In addition, avoid the use of server-side image maps.
Note that in this DTD there is no name attribute. That
is only available in the transitional and frameset DTD.
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
================ Forms ===============================================
Each label must not contain more than ONE field
Label elements shouldn't be nested.
form control
the name attribute is required for all but submit & reset
option selector
option group
selectable choice
multi-line text field
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.
NOTE: this content model is different from the XHTML 1.0 DTD,
closer to the intended content model in HTML4 DTD
fieldset label
Content is "Flow" excluding a, form and form controls
======================= Tables =======================================
Derived from IETF HTML table standard, see [RFC1942]
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. The values are not the same as
CALS to avoid a name clash with the valign attribute.
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"
horizontal alignment attributes for cell contents
char alignment char, e.g. char=':'
charoff offset for alignment char
vertical alignment attributes for cell contents
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.
colgroup groups a set of col elements. It allows you to group
several semantically related columns together.
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.
Scope is simpler than headers attribute for common tables
th is for headers, td for data and for cells acting as both