Monday 04 July 2005 Arabica: XPath: union - nearly there

Committed some changes which allow NodeSets to be sorted into document order. This, in turn, allows union expressions to be evaluated correctly. So far, the node comparision works for nodes within the same document. I haven't yet implemented comparisions across documents, or for orphaned node and subtrees.

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Tagged code, arabica, xml, and c++

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