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> I think what we need for handling key constraints easily is non-ambiguous > regular tree grammars, Agreed in the sense that key/keyref constraint is enforceable only under non-ambiguous grammars. > I think we should get around this a little bit -- there could be multiple > solutions -- first check whether we can ensure that when we have to > specify key constraints (I think results of document processing do not > need to specify key constraints), therefore I tentatively believe that we > need key constraints only for the initial data modeling part, then there Ummm. I can't get this... Are you saying that deterministic grammar makes enforcement of key/keyref constraint easy because it is guaranteed to be unambiguous? Or is there something more? -- Kohsuke KAWAGUCHI +1 650 786 0721 Sun Microsystems kohsuke.kawaguchi@e...
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