xslt - Detecting if a node exists? -

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i have set of data called <testdata> many nodes inside.

how detect if node exists or not?

i've tried

<xsl:if test="/testdata">

and

<xsl:if test="../testdata">

neither 1 works. i'm sure possible i'm not sure how. :p

for context xml file laid out this

<overall>  <body/>  <state/>  <data/>(the 1 want access  </overall>

i'm in <body> tag, though i'd access globally. shouldn't /overall/data work?

edit 2: right have index data need use @ anytime when apply templates tags inside of body. how tell, while in body, data exists? does, doesn't. can't control that. :)

try count(.//testdata) &gt; 0.

however if context node textdata , want test whether has somenode child or not write:

  <xsl:if test="somenode">      ...   </xsl:if>

but think that's not want. think should read on different techniques of writing xslt stylesheets (push/pull processing, etc.). when applying these, such expressions not necessary , stylesheets become simplier.


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