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(Advanced?) GetElementsByTagName question

Suppose part of my XML response looks like this:

<t:ExtendedProperty>
<t:ExtendedFieldURI PropertyTag="0x3fd9" PropertyType="String" />
<t:Value>Hello 1</t:Value>
</t:ExtendedProperty>
<t:ExtendedProperty>
<t:ExtendedFieldURI PropertyTag="0x10f3" PropertyType="String" />
<t:Value>Hello 2</t:Value>
</t:ExtendedProperty>

How can I use getElementsByTagName to get the second value? If I use "t:Value", I get the first one, of course, but how can I use the PropertyTag value to tell it that I want the second t:Value ?

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mvgeertruyen

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LeeDerbyshire

ASKER

Do you have a pointer to a simple XPath example that would work in a situation like this? I would like the be able to do something like:
getElementsByTagName("t:ExtendedFieldURI[PropertyTag="0x10f3"]/t:Value")

mvgeertruyen

sure; here are a couple of examples:
http://snippets.dzone.com/posts/show/5272
http://www.w3schools.com/xpath/xpath_examples.asp

LeeDerbyshire

ASKER

Sorry to seem so dense, but I just can't seem to get it working. From what I've read, this should work:

getElementsByTagName("t:ExtendedFieldURI[@PropertyTag="0x10f3"]/t:Value")

but it doesn't.

LeeDerbyshire

ASKER

Ugh, I just noticed a small, but significant, complication. The t:ExtendedFieldURI field has a closing / within the tag. Which, of course, means that t:Value isn't a child of it (obvious, now). I think I need to use it's ancestor - I'll see what I can find out about it.

LeeDerbyshire

ASKER

Okay, I have it:

//t:Value[ancestor::t:ExtendedProperty/t:ExtendedFieldURI/@PropertyTag=""0x1090""]

Doesn't work with GetElementsByTagName, though. I have to use SelectSingleNode