Attributes, namespace partitions, and schemas
rwaldin at pacbell.net
Sun Dec 19 17:02:22 GMT 1999
OK, I think I've answered my own questions here by re-reading the spec a few
times and digging through a ton of posts on this subject from earlier this year.
A little confirmation would help tho...
> Given the following XML:
> <a xmlns="uri1" xmlns:b="uri1" c="d" b:c="e"/>
> Is it possible for a schema to indicate that the above is allowed or
Yes, the unconstrained wildcard attribute specification <anyAttribute/> allows
this, but there is no way to explicitly allow a particular global attribute yet.
> Should SAX2 report two attributes with the same localName and namespaceURI?
No. The per-element attribute (c) should have a null namespaceUri and the global
attribute (b:c) should have a namespaceUri of "uri1".
> Which value for c should an application honor if it encounters such a case?
Depends on whether the application is looking for a per-element attribute or a
global attribute. Maybe both.
So the bottom line is, there are two "classes" of attribute: global and
per-element. Global attributes and per-element attributes may belong to the
same namespace indirectly, but never share namespaceUris directly as per-element
attributes don't really have namespaceUris of their own.
This also explains why "default namespaces do not apply directly to attributes".
Unqualified attributes *always* belong *indirectly* to whatever namespace their
parent element belongs to, so they can never *directly* belong to the default
(unqualified) namespace as global attributes.
Is this even close to correct? TIA...
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