1. Why did you base the datatype on cstring?  That's inappropriate for
anything except guaranteed-short strings, because it's not toastable.

It's only my laziness. I can adapt patch for TEXT. It's only temporary solution. The goal is true xml type.

2. Is it really necessary to hack up the grammar for this?  Seems like
you should create ordinary functions to manipulate the datatype(s).
If every datatype thought it could do this sort of thing, we'd have
a completely unmanageable grammar.

                        regards, tom lane

I prefere any general solution. But there isn't. I hope SQL/XML syntax is exception and the solution SQL/XML function is relative clean. There was ideas about pretranslators from different syntaxs. Is this idea dead?

Pavel Stehule

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