Axiom should reject attempts to create illegal namespace declarations
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Key: AXIOM-372
URL: https://issues.apache.org/jira/browse/AXIOM-372
Project: Axiom
Issue Type: Bug
Components: API, DOOM, LLOM
Affects Versions: 1.2.12
Reporter: Andreas Veithen
Assignee: Andreas Veithen
Priority: Minor
According to the Namespaces in XML 1.0 (Second Edition) specification, it is
illegal to bind a namespace prefix to the empty namespace URI. Only the default
namespace can have an empty URI:
"[Definition: If the attribute name matches PrefixedAttName, then the NCName
gives the namespace prefix, used to associate element and attribute names with
the namespace name in the attribute value in the scope of the element to which
the declaration is attached. In such declarations, the namespace name may not
be empty. ]"
(Note that this constraint was dropped in the Namespaces in XML 1.1
specification)
OMElement#declareNamespace doesn't enforce this constraint and namespace
declarations that violate this requirement are silently dropped during
serialization (by code in OMSerializerUtil#isAssociated). This behavior is
problematic because it may result in subtle issues such as unbound namespace
prefixes.
The serialization code should throw an exception if the object model contains
an invalid namespace declaration. We should also make sure that Axiom itself
never generates such invalid namespace declarations. Indeed, the code in
OMSerializerUtil#isAssociated has the following comment:
"Cannot associate a prefix with an unqualifed name. However sometimes axiom
creates a fake prefix name if xmns="" is not in effect."
If this is true, then Axiom needs to be fixed.
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