[xsl] Extract values from first occurrence of a node

["Matthew Mateyak" <mmateyak@xxxxxxxxxxx>]

I am trying to translate XML via XSL/XSLT need to specifically extract the 
values from the first occurrence of a particular node and ignore the rest of 
that same node.

I was attempting to use preceding-sibling::nodeset/node to verify if the 
match has already been made, but having little luck because I not only need 
to match the node but match substrings of the node's value.

Example XML:

<A>
<B>12345 ABCD</B>
<B>12344 ABCD</B>
<B>12333 EFGH</B>
<B>12344 WXYZ</B>
</A>

What I need to do:

Recognize the first <B> with 12344 (substring from 1 with length 5) and 
extract ABCD (substring from 7 with length 4), but ignore all other <B>

This is a very basic example, the XML I am working with is a bit more 
complicated and it is being translated via XSL-FO for PDF generation.

The biggest problem I am having with XSL/XSLT is detaching from my 
procedural language experience!  From my experience, I am having success in 
mapping singlular nodes but more difficulty when trying to accomplish 
"decision logic" in a non-procedural manner.

Any suggestions or recommended reads would be great.

Thanks,
Matt

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