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   Re: Unspecified #IMPLIED attributes in Java

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  • From: Paul Prescod <papresco@technologist.com>
  • To: "XML developers' list" <xml-dev@ic.ac.uk>
  • Date: Fri, 19 Dec 1997 11:02:17 -0500

Toby Speight wrote:
> If I write a {grove, tree} builder, it would be useful to know whether
> a DTD was used, so that it can report an error to an application trying
> to access an attribute that was not declared (this may be the symptom
> of a typo, perhaps).  If a DTD was not used for the parse, then the
> access should return null (as if the attribute were declared #IMPLIED).

The DSSSL model is that trying to access a random attribute merely
returns #f. Although this could allow a typo to pass, it has the benefit
of making stylesheets a little more robust to DTD variations. For
instance, the same stylesheet can work with various versions of HTML.

 Paul Prescod

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