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http://www.google.com/codesearch#search/&q=hasFeature%5Cs*%5C(%5B%5E,%5D%2B,%5Cs*null%5Cs*%5C)&type=cs The "XPath" feature checks look scary. I think we need to stringify null to "" in hasFeature's second argument.
https://bitbucket.org/ms2ger/dom-core/changeset/45e9b35bc50a