In XML/XSLT.pm. You can find the full path using the following: 
perl -e'use XML::XSLT; print $INC{"XML/XSLT.pm"}'

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Update: Or 

perldoc -l XML::XSLT

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In reply to Re^7: xml::xslt xpath question (solution) by ikegami
in thread xml::xslt xpath question by Anonymous Monk

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