XTags feature request

[David Green <da...@maketechnologies.com>]

A problem that I've encountered is related to xpaths and namespace prefixes:


if the parsed document has namespace prefixes, then our xpaths must
reference these -- however, if the expected document has changed prefixes
but same namespace uris (and is equivalent to the original), then my xpaths
break.

As far as I can see, XTags doesn't address this issue.  If it does, could
someone direct me to information on this?  Otherwise, how about this feature
request:


It would be great if we could specify a per-page prefix-to-namespace mapping
using XTags.  This could be done by specifying a per-page DocumentFactory
instance, instead of what XTags currently does, which is using the global
instance org.dom4j.DocumentFactory#getInstance().  We could then call
org.dom4j.DocumentFactory#setNamespaceURIs(java.util.Map) on the per-page
factory.

Looking at the code, this change would be relatively easy to make.  The
following would do it:

org.apache.taglibs.xtags.xpath.AbstractTag#getDocumentFactory() could be
modified as follows:

protected DocumentFactory getDocumentFactory() {
  // get the page-scope factory if available.
  DocumentFactory factory = (DocumentFactory)
pageContext.getAttribute(CTX_ATTRIBUTE_NAME_DOCUMENTFACTORY);
  if (factory != null) return factory;

  // if not available, return the default instance.
  return DocumentFactory.getInstance();
}

A new tag could be created that would set the page-scope factory and
associated prefix-to-uri mapping as follows:

syntax example:

<xtags:defineUriPrefixes>
  <xtags:namespaceDefinition uri="urn:foo.bar" prefix="foobar"/>
  <xtags:namespaceDefinition uri="urn:example.com/some/uri" prefix="ecom"/>
</xtags:defineUriPrefixes>


I hope to hear comments on this.  If necessary, I can contribute the code
required to make it work.

David

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