Add methods to OMElement that allow calculating the namespace context of an
element
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Key: AXIOM-388
URL: https://issues.apache.org/jira/browse/AXIOM-388
Project: Axiom
Issue Type: New Feature
Components: API
Reporter: Andreas Veithen
There are a couple of things that the average Java developer is unable to code
correctly. One of these things is calculating the namespace context of an
element in an XML document.
Examples:
(1) The following change in Axis2 attempts to resolve an issue where the
databinding fails to resolve a QName value if the prefix is declared on the
SOAP envelope:
http://svn.apache.org/viewvc?view=revision&revision=398161
Strictly speaking this change is incorrect because it only takes into account
namespaces declared on the soap:Envelope, but not on the soap:Body.
(2) The following change in Synapse adds code to compile an XPath expression
retrieved from an XML configuration document:
http://svn.apache.org/viewvc/synapse/trunk/java/modules/core/src/main/java/org/apache/synapse/mediators/Value.java?view=diff&r1=1080144&r2=1080145&pathrev=1080145
To build the namespace context for the XPath expression, the code uses
OMElement#getAllDeclaredNamespaces() on the element that has the attribute the
XPath expression is extracted from. That is incorrect because namespaces
relevant for the interpretation of the XPath expression may also be declared on
ancestors of this element.
(3) RAMPART-40 introduces code that attempts to build a namespace context by
scanning the entire document tree for namespace declarations (!).
To avoid these issues and to make life easier for developers, Axiom should
define high level methods that allow to calculate the namespace context of a
given element. There should be actually two methods:
* One that returns an iterator over all namespace declarations in scope. This
method could be used e.g. to initialize the namespace context of an XPath
expression.
* One that returns a NamespaceContext object that can be used with other XML
APIs that support this interface.
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