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   Re: XSchema Spec, Sections 2.0 and 2.1 (Draft 1)

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  • From: Chris Maden <crism@oreilly.com>
  • To: xml-dev@ic.ac.uk
  • Date: Mon, 8 Jun 1998 12:31:42 -0400 (EDT)

[Simon St.Laurent]
> <!ELEMENT XSC:XSchema (Doc?, (ElementDecl | Entity | Notation |
> Namespace | XSchema)*)>

(1) Remember that namespaces confer no magic for validation; this
declaration probably meant to be:

<!ELEMENT XSC:XSchema (XSC:Doc?, (XSC:ElementDecl | XSC:Entity |
XSC:Notation | XSC:Namespace | XSC:XSchema)*)>

Me, I'm partial to lower-case, and would even prefer:

<!ELEMENT xsc:xschema (xsc:doc?, (xsc:elementdecl | xsc:entity |
xsc:notation | xsc:namespace | xsc:xschema)*)>

(2) I feel very strongly that XSchema should not define entities for
use in documents.  If it does, you're only inventing a new syntax for
DTDs, and inheriting all of their problems, to which I say: "big

The biggest problem with DTDs (IMO) is that they conflate definitions
for a class of documents with definitions for a single document
instance.  A schema should try, as cleanly as possible, to refer only
to the *class* of documents, and leave entities out of it.  After
XSchema is successful, then we can move on to tackle a new and better
syntax for entity declaration.

Now, it may be that the "Entity" element is only intended for use
within the schema.  If so, great, but I think the name should reflect
that.  Maybe call it "module"?

<xsc:module id="para.content">
    <xsc:element idref="emph"/>
    <xsc:element idref="term"/>
    <xsc:element idref="quote"/>
    <xsc:element idref="literal"/>

<xsc:elementdecl id="para">
    <xsc:modref idref="para.content"/>

(Note: I'm making up the content model syntax here.  But you get the

<!ENTITY crism PUBLIC "-//O'Reilly//NONSGML Christopher R. Maden//EN"
"<URL>http://www.oreilly.com/people/staff/crism/ <TEL>+1.617.499.7487
<USMAIL>90 Sherman Street, Cambridge, MA 02140 USA" NDATA SGML.Geek>

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