将XPath Filter 2.0转换为XPath

Question

如何翻译此XPath Filter 2.0（http://www.w3.org/2002/06/xmldsig-filter2）语句：

<ds:Transform Algorithm="http://www.w3.org/2002/06/xmldsig-filter2">
    <dsig-xpath:XPath xmlns:dsig-xpath="http://www.w3.org/2002/06/xmldsig-filter2" Filter="intersect">
        here()/ancestor::saml2p:ArtifactResolve[1]
    </dsig-xpath:XPath>
</ds:Transform>

<ds:Transform Algorithm="http://www.w3.org/2002/06/xmldsig-filter2">
    <dsig-xpath:XPath xmlns:dsig-xpath="http://www.w3.org/2002/06/xmldsig-filter2" Filter="subtract">
        here()/ancestor::ds:Signature[1]
    </dsig-xpath:XPath>
</ds:Transform>

到XPath（http://www.w3.org/TR/1999/REC-xpath-19991116）转换？