From: | Mike Fowler <mike(at)mlfowler(dot)com> |
---|---|
To: | Peter Eisentraut <peter_e(at)gmx(dot)net> |
Cc: | pgsql-hackers <pgsql-hackers(at)postgreSQL(dot)org> |
Subject: | Re: [PATCH] Add XMLEXISTS function from the SQL/XML standard |
Date: | 2010-05-27 10:24:11 |
Message-ID: | 4BFE484B.4070708@mlfowler.com |
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Lists: | pgsql-hackers |
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
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