Re: [xsl] node extraction from on the basis of an element

[Jeni Tennison <mail at jenitennison dot com>]

Hi Sunil,

> I have a block of XML where one element my have more then one type
> of data as "<type>" element may have either data like profession or
> topic or specialty. I want to extract only those node which have a
> type profession.
>
> <cc:keywords>
>         <cc:keyword>
>                 <type>profession</type>
>                 <ID>1071</ID>
>                 <langstring lang="en_US">Physician</langstring>
>         </cc:keyword>
>         <cc:keyword>
>                 <type>specialty</type>
>                 <ID>102</ID>
>                 <langstring lang="en_US">CLINICAL</langstring>
>         </cc:keyword>
>         <cc:keyword>
>                 <type>specialty</type>
>                 <ID>115</ID>
>                 <langstring lang="en_US">INFECTIOUS DISEASE</langstring>
>         </cc:keyword>
> </cc:keywords>

This piece of XML is well-formed, but it doesn't conform to the
namespaces Recommendation because it doesn't have a namespace
declaration for the 'cc' prefix, so an XSLT processor won't be able to
use it. Assuming it actually looks like:

<cc:keywords xmlns:cc="http://www.cecity.com/xml/cecity_classification";>
...
</cc:keywords>

I'm also going to assume that you don't have a default namespace
declaration in your source XML document. If you do, then the answer is
different.

You need to declare the
http://www.cecity.com/xml/cecity_classification namespace in your
stylesheet:

<xsl:stylesheet version="1.0"
                xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
                xmlns:cc="http://www.cecity.com/xml/cecity_classification";>
...
</xsl:stylesheet>

then you need to start from the root node:

  /

travel down step by step to the cc:keyword elements:

 /cc:keywords/cc:keyword

and use a predicate to identify those whose child type element (in no
namespace) is equal to the string 'profession':

  /cc:keywords/cc:keyword[type = 'profession']

I hope that helps,

Jeni

---
Jeni Tennison
http://www.jenitennison.com/


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