document("")

Just voted my first 5 on this very important bug that shows W3C standard conformance breakage.

Such XPathNavigator instance could be kept in memory only for such a stylesheet that contains document("")document() (it could be done in static analysis). So the reason of "by design" does not make sense.

Real developers could just implement standard-conformant implementation in easy way, instead of using casuistry on whether it is conformant or not, which just result in imposing annoyance on real users.

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