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Re: XPath query comparisons

From: Martin Honnen <mahotrash@-----.-->
To: NULL
Date: 12/3/2008 12:57:00 PM
barnum@b... wrote:

> maybe this is not possible to answer, but is there a formal way to
> compare Xpath queries?
> Almost like a Query mathematics?
> 
> What I want to do is say if an Xpath is "wider" than a previous one.
> We have our data remotely, and we cache the qery result.
> So we don't want to perform a new (remote) query if the new one is
> "narrower" or equal.
> (Assuming the remote data hasn't changed.)

I could imagine that implementors of XSLT, XQuery and XPath solutions 
analyze XPath expressions for optimization. So you might find more 
expertise on that question on the XSL list 
http://www.mulberrytech.com/xsl/xsl-list/.



-- 

	Martin Honnen --- MVP XML
	http://JavaScript.FAQTs.com/


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