using parameters in a select

I would use a parameter to pass in the XPath to my select statement.

For example,
<xsl:param name="servicePlanNames" select="'default value'"/>
<xsl:apply-templates select="ServicePlan[$servicePlanNames]" />

This is not working.  Can I use parameters in the apply-templates select
statement?  If not, is a different way I can pass in XPath to a select
statement?  Or an xsl:if statement?

Thanks in advance,
Leah


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