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   RE: [xml-dev] Annotations in XPath-NG? (Re: [xml-dev] XPath/XSLT 2.0 co

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Yah Jeni,

I am really talking about annotations at the domain level [If you were at my
presentation at eXtreme, this is all relevant to that topic].  We've got the
content marked up with annotations, and now we want somewhat better
infrastructure so as to make it easier to generate/process the information
we are producing.

I've also got the problem that the collection of annotations can grow
arbitrarily large, and many will be in separate documents.

For practical reasons, I cannot force the use of a single source document
for annotations, although I can restrict annotations to be within the
collection or parent collections.

Back to XPath-NG: The notion of XPath extensions that support nodes above
the document [i.e., collection nodes and repository nodes] would be pretty
useful.  For example, we want to be able to create an XPath expression that
searches a specified collection or document within a collection.

So (in the following, treat fsname() as a name test where the argument is a
node name in a filesystem instead of a QName [so you can have spaces, et
cetera in your names]):

Collection::fsname("bar")//foo 	; find all foo elements in documents that
belong to collections with the name "bar".
Collection::fsname("bar")/Collection::fsname("baz")//foo	; find all foo
elements in documents that belong to collections named "baz" contained
within collections named "bar"
Collection::fsname("bar")/Document::fsname("quuz")//foo	; find all foo
elements in documetns named "quuz" in collections named "bar".

Interestingly enough, if your filesystem hierarchy is represented by an XML
document of the form:

<Collection fsname="bar">
	<Document fsname="quuz"/>
	<Collection fsname="baz"/>

Then as Gavin would say:  It's just a simple matter of transformation and
you are done.  Implementation should be a cinch.



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