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https://issues.apache.org/jira/browse/AXIOM-372?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andreas Veithen resolved AXIOM-372.
-----------------------------------

       Resolution: Fixed
    Fix Version/s: 1.2.13

> Axiom should reject attempts to create illegal namespace declarations
> ---------------------------------------------------------------------
>
>                 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
>             Fix For: 1.2.13
>
>
> 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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