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   XML 1.0 : <!ELEMENT P (#PCDATA | S+)*>

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  • From: David Megginson <ak117@freenet.carleton.ca>
  • To: "Xml-Dev" <xml-dev@ic.ac.uk>
  • Date: Fri, 1 May 1998 13:46:15 -0400

Patrice Bonhomme writes:

 > I am very surprise to see that the XML spec 1.0 cannot authorize
 > the following element declaration (because of the +):
 > <!ELEMENT P     (#PCDATA | S+)*>
 > I am wrong ?

Entirely correct; however, there is no XML content matched by 

  (#PCDATA | s+)*

that is not also matched by

  (#PCDATA | s)*

More generally,

  (a+)* = (a*)+ = (a*)* = (a?)+ = (a?)* = (a)*

XML forces you to reduce mixed content models to the simplest

All the best,


David Megginson                 ak117@freenet.carleton.ca
Microstar Software Ltd.         dmeggins@microstar.com

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