[PATCH] Add XMLEXISTS function from the SQL/XML standard
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From: Mike Fowler on 27 May 2010 06:24 Peter Eisentraut wrote: > On ons, 2010-05-26 at 11:47 +0100, Mike Fowler wrote: > >>> The XMLEXISTS function works with XQuery expressions and doesn't have >>> the call signature that your patch implements >>> >> Looking at the manuals of Oracle, Derby and DB2 I see how the call >> signature differs. I also note that Oracle's implementation is XPath >> only, Derby's is partial XQuery and DB2 appears to be full XQuery. >> >> What do people prefer me to do? I see the options as: >> >> 1) Change the call signature to match the standard >> 2) Change the function name back to xpath_exists >> > > It would be nice to make XMLEXISTS work as in the standard, seeing how > many others are providing the same interface. > > >> Should option one be the more popular there's further choices: >> >> 1) Integrate XQuery support to completely match the standard, however >> this will require the addition of a new library libxquery >> 2) Leave the XPath as is, inline with Oracle's implementation >> 3) Hybrid approach. Since XML is a comple time option, add XQuery as >> another. Conditional completion gives the full XQuery support when >> available or just the XPath when not >> > > I think providing XPath is enough, at least for now Agreed. I'll get another patch together in the next day or two. Regards, -- Mike Fowler Registered Linux user: 379787 -- Sent via pgsql-hackers mailing list (pgsql-hackers(a)postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers |