[xsl] Looping through parameters

Dear XSL-listers

Is there an XPath expression that will allow me to generically refer to one or more parameters passed externally into a stylesheet? e.g.

<xsl:for-each select="external-parameter-passed-in">
    do something with each parameter
</xsl:for-each>

I want to be able to handle the parameters generically, rather than by each parameter name as shown below which repeats the code <!--stuff-->
.
<!--check to see that param1 is not null-->
<xsl:if test="$param1!=''">
    <!--stuff-->
</xsl:if>
<xsl:if test="$param2!=''">
    <!--stuff-->
</xsl:if>
<xsl:if test="$param3!=''">
      <!--stuff-->
</xsl:if>

etc

Duncan

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