Complex predicate question

dcheslow · February 25th, 2007, 01:54 PM

Hi folks,

I am working with an xml document that has the form (obviously there is more to it, but this is the relevant bit):

<object>
   <hasOne>
      <relate from="xxx" />
   </hasOne>
</object>

I am trying to write an XPath (1.0) expression that selects all the <hasOne> nodes which have a <relate> node which have a specific 'from' attribute. I came up with:

"/object/hasOne[/descendant::relate/attribute::from='zzz']"

but it's not working for me. Any thoughts? Thanks in advance,

=dave=

joefawcett · February 25th, 2007, 02:04 PM

/ means you want to start from the root. Assuming relate is always a child of hasOne and object is the document element then:

Code:

/object/hasOne[relate/@from = 'xxx']

should do it.

--

Joe (Microsoft MVP - XML)

dcheslow · February 25th, 2007, 02:16 PM

Joe;

That is what I thought too... no joy.

=dave=

dcheslow · February 25th, 2007, 02:20 PM

Oops... my bad.

Joe, you are correct, I had tried: /object/hasOne[/relate...
not: /object/hasOne[relate...

What a difference a slash makes! Thanks for such a prompt and helpful response.

=dave=

joefawcett · February 25th, 2007, 02:21 PM

Well if you have read the first post in this section regarding namespaces and that does not apply then you need to post the full XML and show the relevant XSLT too.

--

Joe (Microsoft MVP - XML)