[xsl] Finding out the existence of a node

["Kalyan Kumar Mudumbai" <kalyan_tech@xxxxxxxxxxxxxx>]

Hi,
    is there a way to find out if a particular node exists in an 
xml file or not?
For example, I have an xml file which has a node <MyName>, how can 
I know if the same node is also present in another xml file which 
the stylesheet is processing?

<xsl:variable name="node_name" select="local-name()"/>
gives me the name of the node into the variable node_name.

<xsl:param name="source" select="./Doc.xml"/>
gives selects the path of Doc.xml into $source

Now how do I know whether $node_name is present in Doc.xml or not? 
Please help me out.

Thanks,

Kalyan
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