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Empty AttlistDecl

  • From: David Megginson <ak117@f...>
  • To: xml-dev@i...
  • Date: Tue, 27 Jan 1998 08:44:44 -0500

stylus security features
Stefan Mintert writes:

 > What's the purpose of an empty AttlistDecl?
 > Shouldn't production [52] read instead as follows?
 >        AttlistDecl ::= '<!ATTLIST' S Name AttDef+ S? '>'
 > (+ instead of *)

Actually, it turns out to be remarkably useful for external DTD
subsets.  Consider this:

    <!ENTITY % security-atts "
      level CDATA #REQUIRED
      auth CDATA #REQUIRED">
  <!ENTITY % security-atts "">

  <!ATTLIST section %security-atts;>

Now, if the %security; parameter entity is set to "INCLUDE" (to enable
security features), you will get

  <!ATTLIST section

If the %security; parameter entity is set to "IGNORE" (to disable
security features), you will get

  <!ATTLIST section>

Fortunately, this is still legal in XML.

All the best,


David Megginson                 ak117@f...
Microstar Software Ltd.         dmeggins@m...

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