Re: Extract values from first occurrence of a node

  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>

do you mean "ignore other B" or "ignore other B which start 12344"

in the first case

<xsl:template match="A">
 <xsl:apply-templates select="B[starts-with(.,'12344')][1]"/>
</xsl:template>

In the second interpretation of your question, you want to just
find the first B with a specified sort key (first five letters)
Then the answer of yesterday holds:

> This is a "grouping problem" 
> 
> see
> 
> http://www.jenitennison.com/xslt/grouping/index.html
> 
> David
> 

Specifically, set up a key of first five characters of a B node

<xsl:key name="x" match="B" use="substring(.,1,5)"/>

then muenchify your selection (See Jeni's site)

<xsl:template match="A">
 <xsl:apply-templates select="B[generate-id(.)=generate-id(key('x',substring(.,1,5)))]"/>
</xsl:template>

which will select the first B node with each unique first five letter
string.

ie the ones marked with !!
<A>
<B>12345 ABCD</B>!!
<B>12344 ABCD</B>!!
<B>12333 EFGH</B>!!
<B>12344 WXYZ</B>
</A>

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