XSLT Transformation with match

I have the following xml and I'm writing a XSLT to transform it:

<callop>
    <con>unit</con>
    <var>u</var>
    <var>v</var>
</callop>

The problem is that if <callop> is inside <is> then it should be a <nano> element and <con> becomes <Fun> but otherwise it's an <Atom> and <con> becomes a <Rel>.

How is th开发者_开发知识库is possible. Do I have to go and check what the parent node is?

You can handle this pretty easily by just specifying your templates with the full path. The more specific template match will take precedence, so there shouldn't be any issues.

<xsl:template match="is/callop">
   <nano>
     ...
...

<xsl:template match="callop">
   <Atom>
     ...
...