given that the operations permitted on a result tree fragment are a
subset of those permitted on a node-set?
actually the operations permitted on an rtf are exactly those allowed on
string. So it all depends how the OP wants to model null, just use a
value to model null that's not used elsewhere and then test for that.
""
or
"null"
or
"why any data outside of an SQL database wants a null value baffles me"
David
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