RXP [1] agrees that the first is well-formed and namespace-conformant but
not valid, the second is well-formed but not namespace-conformant or
valid, and the third is valid and namespace-conformant.
ht
[1] http://www.ltg.ed.ac.uk/~richard/rxp.html
--
Henry S. Thompson, HCRC Language Technology Group, University of Edinburgh
Half-time member of W3C Team
2 Buccleuch Place, Edinburgh EH8 9LW, SCOTLAND -- (44) 131 650-4440
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URL: http://www.ltg.ed.ac.uk/~ht/
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