Between raw and cooked II: Are? DTDs are just for validation
jborden at mediaone.net
Thu Apr 1 16:54:16 BST 1999
David Megginson wrote:
>There *is* a potentially nasty problem lurking here: the DTD may
>contain default values for attributes as well as validation
If DTDs *were* only for validation there would be no issue here. However
DTDs provide additional functionality beyond validation, namely default
attributes and entities. The problem exists in that XML parsers can *choose*
whether or not to validate and in so doing the <em>information content</em>
of the XML document is altered.
Validation is optional. Says so. Given this, the question becomes: ought
parsers be allowed to expand entities and default attributes with validation
turned off? What problem does this create?
Perhaps the XML spec should properly specify that:
*if* a DOCTYPE declaration is present which specifies a DTD then
the document must be validated else the parser must generate an error.
(DOCTYPE declarations would remain optional).
In this way document authors would be able to properly specify
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