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RE: XPath predicate and context


xpath predicate
No, I don't think you can do this within a single XPath 1.0 expression.

In XPath 2.0 you can do

for $x in . return /doc/state[@id=$x/@state]

Michael Kay

> -----Original Message-----
> From: Putman, Harold [mailto:PutmanH@d...] 
> Sent: 22 December 2003 15:43
> To: 'xml-dev@l...'
> Subject:  XPath predicate and context
> 
> 
> Is there any way to get information from the context of the 
> current XPath expression, and use that inside a predicate 
> expression. For example, if I have <doc>
>   <state id="OH">Ohio</state>
>   <state id="PA">Pennsylvania</state>
>   <home state="PA"/>
>   <home state="OH"/>
> </doc>             
> I want to write an XPath expression that will give me the 
> name of the state assigned to the home element. Something 
> like this works as long as long as there is only one home: 
> /doc/state[@id=/doc/home/@state] But what I want to do is 
> evaluate an XPath at any home node and get the state name for 
> that node. Something like: /doc/state[@id=current()/@state] 
> Where current would be the context node when the XPath 
> evaluation starts. The problem is that current() is not a 
> part of XPath... In XSLT I would do this using a variable. 
> <xsl:variable name="state">
>   <xsl:value-of select="@state"/>
> </xsl:variable>
> <xsl:value-of select="/doc/state[@id=$state]"/>
> But, it seems like there should be a way to do this with 
> XPath alone. Is there a way?
> 
> Thanks,
> Harold Putman
> 
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