SAX: Implied Attributes

David Megginson ak117 at
Sun Apr 19 21:26:29 BST 1998

Tim Bray writes:

 > At 09:00 PM 4/17/98 -0400, David Megginson wrote:
 > >Should SAX level 1 allow parsers to report implied attributes by
 > >providing null for AttributeList.getValue() (it does not currently do
 > >so)?  The only application I can think of right now is architectural
 > >forms, where an implied attribute can prevent automatic derivation.
 > Nothing in the XML spec suggests that anything should be done about
 > #IMPLIED-but-absent attributes... there was such language but we 
 > deliberately took it out. -Tim

The XML 1.0 spec does not define most of the information model
provided by a parser, so it is not safe to assume that omission means
prohibition; however, I agree with you and with James (from a posting
a few months ago) that it makes sense to pass over unspecified
#IMPLIED attributes in SAX level 1.

Thanks, and all the best,


David Megginson                 ak117 at
Microstar Software Ltd.         dmeggins at

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