Referencing original root when using document function

Hello all,

I have a stylesheet in which a lookup table is defined
e.g.
<par:paramfields>
        <par:paramfield value="value1"/>
        <par:paramfield value="value2"/>
</par:paramfields>

I walk through each of these values:

<xsl:for-each select="document('')/*/par:paramfields/par:paramfield"/>

For every value I want make a transformation for which I use data of the
original xml document. So I need e.g.

<xsl:for-each select="document('')/*/par:paramfields/par:paramfield">
        <xsl:variable name="value" select="./@field"/>
        <xsl:apply-templates select="/traps/trap[(_at_)type=$value]"/>
</xsl:for-each>

However this doesn't work. How to I indicate in the Xpath expression, that I
want to use my original document again ?

Kind regards,
Ismaël

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