Bugfix: a namespace in the inclusive namespace list should be treated… #163
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… where non-exclusive and thus written out on the root note of the canonical document.
According to the WC3 specification, namespaces in the inclusive namespace list should be treated as if by the exclusive algorithm. For a document subset, the exclusive algorithm copies namespaces from ancestor nodes to the root of the document in canonical from (see https://www.w3.org/TR/xml-c14n11/#Example-DocSubsets)
This patch ensures that such ancestor namespaces are treated correctly as well as adding a test for this behavior.