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XML Schema 1.0 and Relax NG Only Partially Support Context-FreeGrammars

• From: "Costello, Roger L." <costello@mitre.org>
• To: "xml-dev@lists.xml.org" <xml-dev@lists.xml.org>
• Date: Wed, 1 Jan 2014 17:39:00 +0000

Hi Folks,

Did you know that neither XML Schema 1.0 nor Relax NG has the power to express this very simple grammar:

	The content of BookStore shall be N Book elements
	followed by N Magazine elements.

That is, BookStore must contain an equal number of Book and Magazine elements.

It's true. 

Neither XML Schema 1.0 nor Relax NG can express that basic context-free grammar. 

That's sad.

More ... http://xfront.com/XML-Schema-1-0-and-Relax-NG-Partially-Support-Context-Free-Grammars.pdf

/Roger

• Follow-Ups:
  • Re: XML Schema 1.0 and Relax NG Only Partially SupportContext-Free Grammars
    • From: Rick Jelliffe <rjelliffe@allette.com.au>
  • Re: XML Schema 1.0 and Relax NG Only Partially SupportContext-Free Grammars
    • From: Liam R E Quin <liam@w3.org>
  • Re: XML Schema 1.0 and Relax NG Only Partially SupportContext-Free Grammars
    • From: Lauren Wood <lauren@textuality.com>