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RE: how can we pass previously built documents into FLWOR expr

• To: <manavaputra@y...>,<xml-dev@l...>
• Subject: RE: how can we pass previously built documents into FLWOR exprs in Saxon?
• From: "Michael Kay" <mike@s...>
• Date: Sat, 4 Feb 2006 09:11:38 -0000
• In-reply-to: <20060204013940.36034.qmail@w...>
• Thread-index: AcYpLBErcxM9yY+oSvKcXzYgmNEGnAAPVXLA

Generic XQuery questions are probably best asked on the xquery-talk list at
xquery.com, and Saxon-specific questions on the saxon-help list or forum at
SourceForge.net. This one falls somewhere in between.

There are three main ways you can pass input documents to a Saxon query:
using the context item; as the value of a named external variable; or using
the doc() function. The obvious way to do it in this case is using an
external variable (or parameter). Declare

declare variable name="doc1" as="document-node()" external;

in the query prolog, and pass the document node as the value of the
parameter at run-time from the Java API, which in Saxon's case means calling
setParameter("doc1", documentNode) on the DynamicQueryContext object. In the
body of the query you can then access the document as $doc1.

Another approach which may work better when you have a variable number of
documents is to write your own URIResolver, so when the doc() function
requests a particular URI, your URIResolver responds by passing the
pre-built document.

Michael Kay
http://www.saxonica.com/

 
> -----Original Message-----
> From: manavaputra@y... [mailto:manavaputra@y...] 
> Sent: 04 February 2006 01:40
> To: xml-dev@l...
> Subject:  how can we pass previously built documents 
> into FLWOR exprs in Saxon?
> 
> I am at the moment testing the SAXON Xpath/XQuery API.
> Most of the time, we work with only one document, but
> there are cases when we work with more than one
> document. The dynamic query context in saxon allows us
> to set only one context node which could be the root
> node of the document. This works fine for FLWOR exprs
> involving a single document and they dont even have to
> use doc() function in their exprs. But if we have,
> say, two documents that the FLWOR exprs are querying,
> then from the API documentation, it appears as though
> we will have to use doc("uri or filepath") function
> calls in which case saxon loads them automatically. My
> problem is that i have to load both the documents
> anyway in my code using the api call to
> StaticQueryContext.buildDocument(StreamSource) and i
> dont want to load them again in FLWOR exprs, because
> it is just a waste of memory considering that large
> xml files do consume a lot of memory. Is there any way
> to pass previously build document root nodes into the
> FLWOR exprs.
> 
> I realize this is xquery/xpath specific question and
> more so specially for saxon. If there are other lists
> dedicated for this purpose, please do let me know.
> 
> Thanks
> Manava
> 
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