Currently, cursor_to_xml returns an empty string when the end of the
cursor is reached (meaning the fetch returned zero rows).  As discussed
on -general, that's kind of weird, because you'd have to do something
like

IF val::text = ''

to test for the end, since there is no = operator for xml, and also
because '' isn't a valid XML value at all.

What would be a good way to address this?  Return null perhaps?


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