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RE: namespaces support decision table
- From: "Michael Kay" <mike@s...>
- To: "'Shlomo Yona'" <S.Yona@F...>,<xml-dev@l...>
- Date: Wed, 30 May 2007 10:59:06 +0100
Your questions seem to suggest a lot of confusion, and I
don't think that can be solved by answering them directly.
An element (instance) has a name (the "expanded name")
that's in two parts: namesapce URI and local name. The local name is as written
in the source, the namespace URI is obtained by looking for the namespace
binding of its prefix and/or the default namespace.
A schema defines rules for elements in terms of their
expanded name. When you use an element name in name="x" its local name is x and
it's namespace URI is either null or the target namespace depending on the
values of elementForm and elementFormDefault. If you use an element name in
ref="[p:]x" then its local name is x and its namespace URI is obtained by
looking for the namespace binding of p or the default
If the expanded name in the schema is different from the
expanded name in the instance (whether it's the local names that differ or the
URIs) then they're simply talking about different elements.
I am trying to understand the
impact of schema hints and evidence from XML documents on the proper handling
of namespaces. Here is what I came up with
a. Name is qualified in XML
b. Name is prefixed in XML
document: yes/no (default namespace is also considered as a prefix, the empty
string prefix, for this discussion’s sake)
c. Prefix for name is defined in
XML document: yes/no
There are 8 possibilities for the
An error should be issued (not
necessarily same error in all cases) in all cases except for the following
My question is, are these indeed
all possibilities? Are there other factors that need to be considered? Is my
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