The <xsl:param> and <xsl:with-param> Elements:Creating Parameters
Parameters are much like variables, except they’re usually used with named templates. Parameters enable you to pass values into templates. You create parameters with the <xsl:param> element, which has two attributes:
name(mandatory). The name of the variable, set to a QName.
select(optional). The default value of the parameter. Set to an XPath expression.
Like <xsl:variable>, this element can either be a top-level element or be used inside a template body. Parameters created with top-level <xsl:param> elements are global parameters, and those created inside templates are local parameters. If you create a parameter inside a template body, the <xsl:param> element should come before ...
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