Revised definition of step type checking algorithm for Appendix G

Further to discussion on today's call, changed name per Vojtech's
suggestion, defined bag(-merger) (badly) and added third error clause
to cover the internal pipeline cases.

ht
-- 
       Henry S. Thompson, School of Informatics, University of Edinburgh
                         Half-time member of W3C Team
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Received on Thursday, 6 August 2009 18:07:20 UTC