On tis, 2010-01-05 at 11:50 -0800, Scott Bailey wrote: > > There has been talk about adding something like xpath_string, > > xpath_number, xpath_boolean for fetching xpath expressions that > don't > > return nodesets. I think that would fit your use case. > > The first two sound very much like what I'm looking for. I'm unsure > about the third. Is it's purpose to extract the scalar value of an > expression and cast to bool as the other two do, or is it to identify > if the xpath expression returned any nodes like xmlexists?
XPath as a language has four data types: nodeset, string, number, boolean. So an XPath expression could return any of those types. Then, I suppose, the xpath_foo() function would evaluate the expression and return the result as type foo, possibly raising an error if the types don't match. Details to be determined. -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
