Re: [xsl] Nesting XPath predicates

Subject: Re: [xsl] Nesting XPath predicates
From: Nathan Potter <ndp@xxxxxxxxxxxxxxxxxxxx>
Date: Thu, 24 Apr 2008 12:41:07 -0700
Liam and Andrew,

Thank you for your thoughtfull replies!

I'll be trying to understand keys this afternoon.


Nathan





On Apr 24, 2008, at 10:35 AM, Liam Quin wrote:


On Thu, Apr 24, 2008 at 09:17:05AM +0100, Andrew Welch wrote:
On 24/04/2008, Liam Quin <liam@xxxxxx> wrote:
Easier might be
   <xsl:template match="dataset">
     <xsl:variable name="sn" select="serviceName" />
     <xsl:value-of select="//service/[@name = $sn]/@base" />
   </xsl:template>

It is easier to use a variable when you're learning, but this is what the current() function is for:

Good point.


//service[@name = current()/serviceName]

That will work in the given example, but stops working if you put
that line inside a for-each... or more precisely works differently :-)
so it's fragile, and not a technique that people can build on well.


Ultimately though, you should use a key here:
<xsl:key name="service-by-name" match="service" use="@name"/>
[...]
key('service-by-name', serviceName)

That's probably a better solution.


Best,

Liam

--
Liam Quin, W3C XML Activity Lead, http://www.w3.org/People/Quin/
http://www.holoweb.net/~liam/ * http://www.fromoldbooks.org/


============================================================ Nathan Potter Oregon State University, COAS ndp at coas.oregonstate.edu 104 Ocean. Admin. Bldg. 541 737 2293 voice Corvallis, OR 97331-5503 541 737 2064 fax

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