xml - Check the node is present or not in xslt -


i new xslt, though manage work on it. struck 1 case need expert. trying finding node exists or not. search same question, in didn't expected answer. having node, mainnode->subnode1->subnode2->sunnode3. if checking below

<xsl:if test= "not(//mainnode/subnode1/subnode2/sunnode3)">

which working, if same converts in variable, below 

<xsl:if test= "not(//mainnode/$var1/$var2/sunnode3)">

where, var1 = subnode1, var2 = subnode2

why not working. can't use variable in path searching. if not solution this.

you can't construct path step dynamically using variables. can use variable filter element name, example :

<xsl:if test= "not(//mainnode/*[name()=$var1]/*[name()=$var2]/sunnode3)">

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