#	ibtwsh.dtd
#	This is the Itsy Bitsy Teeny Weeny Simple Hypertext DTD.
#	Its public identifier is -//XML-DEV List//DTD IBTWSH 6.0//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 6.2
#	Diff from 6.1: rel|rel now rel|rev, th|td@headers now IDREFS,
#		table width no longer an integer, non-basic table attrs gone,
#		rowspan and colspan must be non-negative
#	Diff from 6.0: added attributes to ul, comment about img, new meta

# This is a RELAX NG schema which describes a subset of XHTML Basic for
# use within other schemas.  It is by intention equivalent
# (within its scope) to -//W3C//DTD XHTML 1.1//EN, but is
# not a derived work in the copyright sense.

# It is often convenient for XML documents to have a bit of
# documentation somewhere in them.  In the absence of a schema like
# this one, that documentation winds up being <text/> only, which is
# a pity, because rich text adds measurably to the readability of
# documents.  By incorporating this schema by reference (as an
# external parameter entity) into another schema, that schema 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 schema are intended to be
# used within domain-specific elements of the surrounding DTD,
# it is not necessary that every fragment begin with an "html"
# element, as in HTML.  Recommended <define>s for elements
# containing documentation are "horiz.model" for simple
# text fragments and "struct.model" for documents in extenso.

# Declarations

datatypes xsd = "http://www.w3.org/2001/XMLSchema-datatypes"


# Common attributes

# All elements (except full-document elements) can have these attributes

all =		attribute id {xsd:ID}?,
		attribute class {token}?,
		attribute title {text}?

# All non-empty elements can have these attributes

i18n =		attribute xml:lang {text}?,
		attribute dir {"ltr" | "rtl"}?

basic =		all, i18n


# Models

horiz.model =	basic & text & horiz*
vert.model =	horiz.model & vert*
struct.model = 	basic & vert*


# Horizontal formatting elements

horiz =		a | br | horiz.other

a =		element a {
			attribute href {xsd:anyURI}?,
			attribute name {text}?,
			attribute rel | rev {xsd:anyURI}?,
			horiz.model
			}

br =		element br {all, empty}

horiz.other =	element abbr | acronym | cite | code |
			dfn | em | img | kbd | q | samp | span |
			strong | var {horiz.model}


# Vertical formatting elements

vert	=	header | List | table | vert.other

header = 	element h1 | h2 | h3 {horiz.model}


List =		element dl {basic, element dt | dd {horiz.model}+ } |
		element ol|ul {basic, element li {horiz.model}+ }

aligns = 	attribute align {"left" | "center" | "right" | "justified"}?,
		attribute valign {"top" | "middle" | "bottom" | "baseline"}?

table = 	element table {
			basic,
			attribute summary {text}?,
			element caption {horiz.model}?,
			element tr {
				basic,
				aligns,
				tabledata+}+
			}

tabledata =	element th | td {
			aligns,
			attribute abbr {text}?,
			attribute axis {text}?,
			attribute colspan {xsd:nonNegativeInteger}?,
			attribute headers {xsd:IDREFS}?,
			attribute rowspan {xsd:nonNegativeInteger}?,
			attribute scope {"row" | "col" | "rowgroup" | "colgroup"}?,
			vert.model
			}

vert.other =	element address {horiz.model} |
		element blockquote {attribute cite {xsd:anyURI}?, struct.model} |
		element div {struct.model} |
		element p {horiz.model} |
		element pre {horiz.model}


# Support for complete HTML documents

start = 	element html {
			i18n,
			attribute xml:base {xsd:anyURI}?,
			attribute xml:space {"preserve" | "default"}?,
			head,
			element body {basic, vert*}
			}

head =		element head {
			i18n,
			element title {i18n, text},
			element meta {
				attribute name|http-equiv {token}?,
				attribute content {text},
				empty
				}*
			}

# END OF ibtwsh.rnx