I think going through the filtercapabilities and operation description just to 
figure out function args would be too much a burden from a usability pov
even if it _might_ be "correct" thinking in ogc terms

2c-

Gabriel

On Wednesday 07 February 2007 20:27, Justin Deoliveira wrote:
> Jody Garnett wrote:
> > Right - so let's try and be productive.
> >
> > Function - not self describing (it is a representation of data the user
> > provided)
> > FilterCapbilities - contains the descriptive element Function (which
> > extends Operator) looks like the whole mess involves GenericName again.
>
> This is like saying you should not be able to call getClass() from an
> object. It seems perfectly ok to me that the "metadata" that describes a
> function should be available from the function itself.
>
> > I wonder how we can escalate GenericName as a problem with the GeoAPI
> > Library - we have failed thus far (even with forking the idea for
> > TypeName). Jody
>
> I am not interested in getting involved in that mess. I will stick with
> an implementation specific function.
>
> >> Understandable since it came after the fact. In my opinion its not ok,
> >> a function by itself is not self describing enough to create the
> >> FilterCapabilities in the first place!!
> >>
> >> Jody Garnett wrote:
> >>> I see - so the GeoAPI Function API may be "okay", we just not have
> >>> used the full scope of the GeoAPI interfaces needed to define our
> >>> problem?
> >>>
> >>> Sigh!
> >>> Jody
> >>>
> >>>> Unfortunatley I have no way of generating a FilterCapabilities from
> >>>> the functions plugged in via factory api. And no we are not using
> >>>> FilterCapabilities right now. The only use of it I have seen is in
> >>>> Postgis to declare which functions it can encode as sql, which does
> >>>> not report the number of arguments.
> >>>
> >>> -----------------------------------------------------------------------
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-- 
Gabriel Roldán ([EMAIL PROTECTED])
Axios Engineering (http://www.axios.es)
Tel. +34 944 41 63 84
Fax. +34 944 41 64 90

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