feature http://apache.org/xml/features/validation/dynamic 2003-01-16 - By sandygao@(protected)
Hi all,
There seems to be some disagreement between the description of this feature
and its implementation.
The description [1] (along with that of the feature
"http://xml.org/sax/features/validation" [2]) seems to indicate that if you
want dynamic validation, you only need to turn on the dynamic validation
feature, but not the validation feature.
But in the implementation, for dynamic DTD validation to happen, both
features need to be turned on. The implementation of Schema validation, on
the other hand, does work as what the description says: turning on dynamic
validation is sufficient to get the behavior.
So what should we do here? Fix DTD validation so that it doesn't require
both features to be turned on? Or fix the feature description and Schema
implementation? (I talked to some of the committers privately, but didn't
come to a consent. :-( )
The difference between the 2 interpretations only appears when the
validation feature is off, but the dynamic validation feature is on. My
preference would be to fix the DTD validation so that we perform dynamic
validation in the above case. This would make our documentation and
implementation more consistent.
One may fear such change might break some people. But when a user turns on
the dynamic validation feature (whether the validation feature is on or
off), he's expecting something to happen, isn't he? So I don't think we
would actually break anybody.
[1] http://xml.apache.org/xerces2-j/features.html#validation.dynamic
[2] http://xml.apache.org/xerces2-j/features.html#validation
Thanks,
Sandy Gao
Software Developer, IBM Canada
(1-905) 413-3255
sandygao@(protected)
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