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https://issues.apache.org/jira/browse/RAMPART-40?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13030536#comment-13030536
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Andreas Veithen commented on RAMPART-40:
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There is something fundamentally wrong with this change (which is still in
effect in the current code base). The code actually builds a namespace context
by scanning the entire document tree for namespace declarations (see the
findAllPrefixNamespaces method). None of the XML/WS-* specs describe such a
thing. There is also no such thing as a "predefined list of declared
namespaces". A namespace context is always built by starting from a given
element and iterating over its ancestors up to the root node.
This change is actually one of the causes of the bad performance reported by
Dennis Sosnoski [1]. In fact:
* Scanning the entire document causes expansion of nodes that would otherwise
never be built.
* Scanning the entire document and collecting all namespace declarations is a
costly operation.
* The code is executed several times during security processing.
* The code is executed even in scenarios without signatures or encryption.
[1] http://www.ibm.com/developerworks/java/library/j-jws14/index.html
> implementation of the Xpath support
> ------------------------------------
>
> Key: RAMPART-40
> URL: https://issues.apache.org/jira/browse/RAMPART-40
> Project: Rampart
> Issue Type: New Feature
> Components: rampart-core, rampart-policy
> Affects Versions: 1.1, 1.2
> Environment: Apache Axis2 1.2, Rampart-head , tomcat 5.5.23
> Reporter: Angel Todorov
> Fix For: 1.2
>
> Attachments: policy_ut_xpath.xml, svn_diff.txt
>
>
> This is the implementation (SVN Diff attached) of XPath support -
> <SignedElements> , <EncryptedElements>. For now there are two ways to
> retrieve the namespace prefixes. To use a predefined list of declared
> namespaces , as Ruchith is doing with the Optimized message parts , or to
> recursively find all namespaces in the message (that is the default in the
> implementation).
> Ruchith,
> I think we can make some custom parameter in Rampart-config that will set the
> strategy to use regarding namespace prefixes.
> Thanks.
> Regards,
> Angel
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