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How are qualified names mapped to names in XML namespaces?

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If a qualified name in the body of a document (as opposed to the DTD) includes a prefix, then that prefix is used to map the local part of the qualified name to a universal name -- that is, a name in an XML namespace. For example, in the following, the prefix foo is used to map the local names A, B, and C to names in the http://www.foo.org/ namespace:
<?xml version="1.0" ?>
<foo:A xmlns:foo="http://www.foo.org/" foo:C="bar">
<foo:B>abcd
<foo:A>
If a qualified name in the body of a document does not include a prefix and a default XML namespace is in scope then one of two things happens. If the name is used as an element tag, it is mapped to a name in the default XML namespace. If it is used as an attribute name, it is not in any XML namespace. For example, in the following, A and B are in the http://www.foo.org/ namespace and C is not in any XML namespace:
<?xml version="1.0" ?>
<A xmlns="http://www.foo.org/" C="bar">
<B>abcd</B>
<A>
If a qualified name in the body of a document does not include a prefix and no default XML namespace is in scope, then that name is not in any XML namespace. For example, in the following, A, B, and C are not in any XML namespace:
<?xml version="1.0" ?>
<A C="bar">
<B>abcd</B>
<A>
Qualified names in the DTD are never mapped to names in an XML namespace because they are never in the scope of an XML namespace declaration.

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