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RE: Inclusion in XML versus SGML

• To: "xml-dev" <xml-dev@l...>,Sevigny Benoît <Benoit.Sevigny@m...>
• Subject: RE: Inclusion in XML versus SGML
• From: "Michael Fitzgerald" <mike@w...>
• Date: Wed, 20 Feb 2002 09:50:28 -0800
• Importance: Normal
• In-reply-to: <D98A27074EF37B408E838BCF7F41AC70080A35@s...>

According to James Clark's http://www.w3.org/TR/NOTE-sgml-xml.html,
inclusions and exclusions are not allowed in XML DTDs.
For more help on this, see "Inclusions and Exclusions" in Norm Walsh's
http://www.xml.com/pub/a/98/07/dtd/. Quote: "It may be very difficult (even
impossible) to make an XML DTD that is structurally identical to an SGML DTD
that uses inclusions or exclusions."

Why not just something like

<!ELEMENT book (chapter,section,(para|etc|usw)+)>

or in RELAX NG
(http://www.oasis-open.org/committees/relax-ng/tutorial-20011203.html)

<element name="book">
 <element name="chapter">
  <element name="section">
   <interleave>
    <element name="para"><text/></element>
    <element name="etc"><text/></element>
    <element name="usw"><text/></element>
   </interleave>
  </element>
 </element>
</element>

Mike

-----Original Message-----
From: Sevigny Benoît [mailto:Benoit.Sevigny@m...]
Sent: Wednesday, February 20, 2002 8:31 AM
To: xml-dev@l...
Subject:  Inclusion in XML versus SGML


Hi Everybody !

	In SGML, you can do like thing in your DTD declaration :

		<!ELEMENT book (chapter,section) +(para) >

	This mean that that book contain a chapter and a section. The
chapter and section is composed by para.

	Now what I want to know, is how in XML I can declare such thing
(a repeating inclusion).

Thank you to help me !

Benoît Sévigny, Revenu Québec

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    • From: Sevigny Benoît <Benoit.Sevigny@m...>

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