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   Re: namespace of attributes?

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  • From: Joe Lapp <jlapp@webmethods.com>
  • To: xml-dev@ic.ac.uk
  • Date: Sun, 12 Sep 1999 21:35:18 -0400

At 09:12 PM 9/12/1999 -0400, Joe Lapp wrote:
>[...] However, I'm
>believe that the namespaces of the elements and attributes in the following
>DTD subset is unambiguous and uncontroversial:
><!ELEMENT a:e1 (a:e3)*>
><!ATTLIST a:e1 xmlns:a "urn:namespace1">
><!ELEMENT b:e2 (a:e3)*>
><!ATTLIST b:e2 xmlns:b "urn:namespace2">
><!ELEMENT a:e3 (#PCDATA)>
><!ATTLIST a:e3 xmlns:a "urn:namespace1">

I should point out why I think this works.  Namespaces are only parsed and
recognized in the instance, not in the DTD.  Here the DTD says that the
element having exactly name "a:e1" contains an element having exactly name
"a:e3".  The element declaration for "a:e3" associates the 'a' with a
namespace URN, but this association is neither visible nor realized until
parsing an instance that conforms to the DTD.

(I'm trying to head off the argument asserting that you don't know what 'a'
refers to in either contentspec.  I'm saying, "You're right, you don't, but
in the end this doesn't change anything."  You can get a parser to do this
without requiring the instance prefixes to match the prefixes in the DTD.)
Joe Lapp              (Looking for some good people to help design
Senior Engineer        and build the Internet's business-to-business
webMethods, Inc.       XML infrastructure.  We are 100% Java.)
jlapp@webMethods.com   http://www.webMethods.com/company/employment

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