<dsig:Transform xmlns:dsig="http://www.w3.org/2000/09/xmldsig#"
                xmlns:dsig-xpath="http://www.w3.org/2002/06/xmldsig-filter2"
                Algorithm="http://www.w3.org/2002/06/xmldsig-filter2">
  <dsig-xpath:XPath Filter="intersect">//ToBeSigned</dsig-xpath:XPath>
  <dsig-xpath:XPath Filter="subtract">//NotToBeSigned</dsig-xpath:XPath>
  <dsig-xpath:XPath Filter="union">//ReallyToBeSigned</dsig-xpath:XPath>
</dsig:Transform>