IBTWSH DTD 1.0
By: John Cowan 
From:  http://www.ccil.org/~cowan/XML/ibtwsh.dtd

<!--
	ibtwsh.dtd
	This is the Itsy Bitsy Teeny Weeny Simple Hypertext DTD.
	Its public identifier is -//XML-DEV List//DTD IBTWSH 1.0//EN
	The contents are dedicated to the public domain by
		the author, John Cowan <cowan@ccil.org>, except that
		John Cowan retains the moral right to be known as the author.
	This is draft 4.0.1
-->

<!-- 
======================================================================
This is an XML DTD which describes a subset of HTML 4.0 for embedded
use within other XML DTDs.  It is by intention equivalent
(within its scope) to -//W3C//DTD HTML 4.0 Transitional//EN, but is
not a derived work in the copyright sense.  (Brief excerpts from
HTML 4.0 Transitional appear here and there.)

It is often convenient for XML documents to have a bit of
documentation somewhere in them.  In the absence of a DTD like
this one, that documentation winds up being #PCDATA only, which is
a pity, because rich text adds measurably to the readability of
documents.  By incorporating this DTD by reference (as an
external parameter entity) into another DTD, that DTD inherits
the capabilities of this one.  Using HTML-compatible elements
and attributes allows the documentation to be passed straight
through to HTML renderers.

Current HTML renderers can cope with most XML tags, but empty
tags require special treatment.  Inserting a space before the
terminating "/>" usually makes the "/" (which is not HTML)
invisible.  Using "<TAG></TAG>" is not as effective, as the
latter is often misinterpreted as a second "<TAG>".

Note that since the elements of this DTD are intended to be
used within domain-specific elements of the surrounding DTD,
there is no "root element" corresponding to the HTML
element in HTML.  Recommended content models for elements
containing documentation are "%horiz.model;" for simple
text fragments, and "%struct.model;" for documents in extenso.

You can use the XML element to embed arbitrary XML content
into elements declared in this DTD.

Note on draft 4.0:  This draft removes the ugly FONT
element in favor of BIG and SMALL, and no longer provides
ways to set color, the support for which is broken
in many browsers anyhow.
======================================================================
-->


<!-- =========== Common attributes =========== -->

<!-- All elements have these attributes -->
<!ENTITY % all		"id ID #IMPLIED
			class CDATA #IMPLIED
			style CDATA #IMPLIED">

<!-- All non-empty elements have these attributes -->
<!ENTITY % i18n		"lang CDATA #IMPLIED
			dir (ltr|rtl) 'ltr'">

<!ENTITY % basic	"%all; %i18n;">


<!-- =========== Models =========== -->

<!ENTITY % local "CITE | CODE | DFN | EM | BIG | SMALL
		| KBD | SAMP | STRONG | VAR
		| ABBR | ACRONYM">

<!ENTITY % horiz "#PCDATA | %local; | A | BR | SPAN | XML">

<!ENTITY % lists "DL | UL | OL | DIR">

<!ENTITY % blocks "BLOCKQUOTE | DIV | HR | P | PRE">

<!ENTITY % vert "%horiz; | %blocks; | %lists;">

<!ENTITY % headers "H1 | H2 | H3">

<!ENTITY % struct "%vert; | %headers; | ADDRESS">

<!ENTITY % horiz.model "(%horiz;)*">

<!ENTITY % vert.model "(%vert;)*">

<!ENTITY % struct.model "(%struct;)*">


<!-- =========== Horizontal formatting elements =========== -->

<!-- Citation (italics) -->
<!ELEMENT CITE %horiz.model;>
<!ATTLIST CITE
	%basic;>

<!-- Source code (monowidth) -->
<!ELEMENT CODE %horiz.model;>
<!ATTLIST CODE
	%basic;>

<!--Terms being defined (normal) -->
<!ELEMENT DFN %horiz.model;>
<!ATTLIST DFN
	%basic;>

<!--Emphasis (italics) -->
<!ELEMENT EM %horiz.model;>
<!ATTLIST EM
	%basic;>

<!--Keyboard input -->
<!ELEMENT KBD %horiz.model;>
<!ATTLIST KBD
	%basic;>

<!-- Sample output text (monowidth) -->
<!ELEMENT SAMP %horiz.model;>
<!ATTLIST SAMP
	%basic;>

<!-- Strong emphasis (boldface) -->
<!ELEMENT STRONG %horiz.model;>
<!ATTLIST STRONG
	%basic;>

<!-- Variable names (italics) -->
<!ELEMENT VAR %horiz.model;>
<!ATTLIST VAR
	%basic;>

<!-- Abbreviations (normal) -->
<!ELEMENT ABBR %horiz.model;>
<!ATTLIST ABBR
	%basic;>

<!-- Acronyms (normal) -->
<!ELEMENT ACRONYM %horiz.model;>
<!ATTLIST ACRONYM
	%basic;>

<!-- Text importance (change of size) -->
<!ELEMENT BIG %horiz.model;>
<!ATTLIST BIG
	%basic;>

<!ELEMENT SMALL %horiz.model;>
<!ATTLIST SMALL
	%basic;>

<!-- Hypertext anchors.
	CONSTRAINT: A elements are not allowed inside
	other A elements, a fact that XML cannot express. -->
<!ELEMENT A %horiz.model;>
<!ATTLIST A
	%basic;
	href CDATA #IMPLIED
	name CDATA #IMPLIED
	rel CDATA #IMPLIED
	title CDATA #IMPLIED>

<!-- Mandatory line breaks -->
<!ELEMENT BR EMPTY>
<!ATTLIST BR
	%all;>

<!-- Spans of text with changes in basic attributes -->
<!ELEMENT SPAN %horiz.model;>
<!ATTLIST SPAN
	%basic;>

<!-- Arbitrary embedded XML (not HTML-compatible yet) -->
<!ELEMENT XML ANY>
<!ATTLIST XML
	%basic;>


<!-- =========== Headers =========== -->

<!ENTITY % align	"align (left|center|right) #IMPLIED">

<!ELEMENT H1 %horiz.model;>
<!ATTLIST H1
	%align;
	%basic;>

<!ELEMENT H2 %horiz.model;>
<!ATTLIST H2
	%align;
	%basic;>

<!ELEMENT H3 %horiz.model;>
<!ATTLIST H3
	%align;
	%basic;>


<!-- =========== Lists =========== -->

<!ENTITY % compact "compact (compact) #IMPLIED">

<!-- Definition list -->
<!ELEMENT DL (DT|DD)+>
<!ATTLIST DL
	%compact;
	%basic;>

<!-- Defined term -->
<!ELEMENT DT %horiz.model;>
<!ATTLIST DT
	%basic;>

<!-- Definition -->
<!ELEMENT DD %vert.model;>
<!ATTLIST DD
	%basic;>

<!-- Ordered list -->
<!ELEMENT OL (LI)+>
<!ATTLIST OL
	%compact;
	%basic;
	start NMTOKEN #IMPLIED
	type (1|a|A|i|I) #IMPLIED>

<!-- Unordered list -->
<!ELEMENT UL (LI)+>
<!ATTLIST UL
	%compact;
	%basic;>

<!-- Directory (minimal) list -->
<!ELEMENT DIR (LI)+>
<!ATTLIST DIR
	%basic;>

<!-- List element -->
<!ELEMENT LI %vert.model;>
<!ATTLIST LI
	%basic;>



<!-- =========== Other vertical elements =========== -->

<!-- Address block -->
<!ELEMENT ADDRESS (%horiz; | P)*>
<!ATTLIST ADDRESS
	%basic;>

<!-- Block quotation -->
<!ELEMENT BLOCKQUOTE %struct.model;>
<!ATTLIST BLOCKQUOTE
	%basic;>

<!-- General text division -->
<!ELEMENT DIV %struct.model;>
<!ATTLIST DIV
	%align;
	%basic;>

<!-- Horizontal rule -->
<!ELEMENT HR EMPTY>
<!ATTLIST HR
	%all;>

<!-- Paragraph -->
<!ELEMENT P %horiz.model;>
<!ATTLIST P
	%basic;>

<!-- Preformatted text -->
<!ELEMENT PRE %horiz.model;>
<!ATTLIST PRE
	%basic;
	width NMTOKEN #IMPLIED>


<!-- =========== Standard XML and HTML entities =========== -->
<!--

<!ENTITY % XMLlat1 PUBLIC
    "-//XML-DEV List//ENTITIES Latin1//EN"
    "XMLlat1.ent">
 %XMLlat1;

 <!ENTITY % XMLsymbol PUBLIC
    "-//XML-DEV List//ENTITIES Symbols//EN"
    "XMLsymbol.ent">
 %XMLsymbol;

 <!ENTITY % XMLspecial PUBLIC
    "-//XML-DEV List//ENTITIES Special//EN"
    "XMLspecial.ent">
 %XMLspecial;
-->

<!-- =========== END OF ibtwsh.dtd =========== -->