As always, a prettier HTML version of this will be posted shortly at
http://purl.oclc.org/NET/xschema.
Simon St.Laurent
Dynamic HTML: A Primer / XML: A Primer / Cookies
2.6 XSchema Extensions
XSchema provides areas in which XSchema developers can provide supplemental
information and metadata regarding XSchema components in both human- and
machine-readable formats. Human-readable information is provided through the
use of a subset of HTML that conforms to XML syntax, while machine-readable
information may be provided through the XSC:More element.
2.6.1 Documentation Extensions
Human-readable documentation for XSchemas should be provided using the Itsy
Bitsy Teeny Weeny Simple Hypertext (IBTWSH) format created by John Cowan. The
full DTD is available at http://www.ccil.org/~cowan/XML/ibtwsh.dtd.
Documentation that uses portions of the IBTWSH format may be included in the
XSC:Doc element, a subelement available to all declarations. The XSC:Doc
element provides basic formatting options for XSchema documentation.
<!ENTITY % ibtwsh SYSTEM "http://www.ccil.org/~cowan/XML/ibtwsh.dtd">
%ibtwsh;
<!ELEMENT XSC:Doc %horiz.model;>
Any element allowed in the horiz.model set of elements (A, BR, SPAN, XML,
CITE, CODE, DFN, EM, KBD, SAMP, STRONG, VAR, FONT, or parsed character data)
may be used in the XSC:Doc element. Note that IBTWSH does not use namespaces
in order to preserve compatibility with HTML.
XSchema applications should ignore all XSchema declarations (i.e., elements
prefixed with XSC: or the appropriate XSchema prefix) within an XSC:Doc
element.
2.6.2 Other Extensions
The XSC:More element provides an area which developers can use to create
their own supplements to XSchema, defining content types more tightly than is
possible through XSchema 1.0. The XSC: More element has a simple ANY content
model, though XSchema processors should ignore the appearance of any elements
from the XSchema namespace in this area.
<!ELEMENT XSC:More ANY>