[postgis-users] ST_<function> vs <function>

[Barend K=?ISO-8859-1?B?9g==?=bben]

The  SQL-MM specification has ST_ as a prefix to all spatial funcionality
(types, functions), and the newer PostGIS functions will follow that spec...


On 11-09-2007 02:42, "Stephen Woodbridge" <woodbri at swoodbridge.com> wrote:

> This is all I could find:
> 
> Log:
> Added versions of functions with standard ST (Spatial Type) prefixes to
> any functions that were lacking them.  Updated the regression tests to
> include the new functions.
> 
> 
> Richard Greenwood wrote:
>> I'm embarrassed to ask, but what does "ST" stand for?
>> 
>> Rich
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>> On 9/10/07, Obe, Regina <robe.dnd at cityofboston.gov> wrote:
>>> 
>>> 
>>> Steve,
>>> 
>>> Just to add to what Mark said.  There is a little bit more going on than
>>> simply a renaming.
>>> 
>>> Most if not all of the ST relation functions have automatic index use
>>> enabled in them.
>>> 
>>> For example
>>> 
>>> the old within is really closer to the hidden _ST_Within  and the new
>>> ST_Within function is equivalent to writing the old
>>> 
>>> geom1 && geom2 AND Within(geom1, geom2)
>>> 
>>> Same goes for ST_Contains, ST_Overlap etc.
>>> 
>>> Hope that helps,
>>> Regina
>>> 
>>>  ________________________________
>>>  From: postgis-users-bounces at postgis.refractions.net on
>>> behalf of Mark Cave-Ayland
>>> Sent: Sun 9/9/2007 4:30 PM
>>> To: PostGIS Users Discussion
>>> Subject: Re: [postgis-users] ST_<function> vs <function>
>>> 
>>> 
>>> 
>>> 
>>> On Sun, 2007-09-09 at 16:03 -0400, Stephen Woodbridge wrote:
>>>> Hi all,
>>>> 
>>>> I seem to have missed reading some vital post or something.
>>>> 
>>>> What is the difference between ST_<function>() and <function>()?
>>>> Is this just a renaming for namespace issues?
>>>> Are the <function>() names deprecated?
>>>> Are there other benefits to this renaming?
>>>> 
>>>> Please explain or point me to the relevant docs.
>>>> 
>>>> Thanks,
>>>>    -Steve
>>> 
>>> Hi Stephen,
>>> 
>>> I don't remember there being much discussion about this, but the
>>> relevant commit can be found here:
>>> http://postgis.refractions.net/pipermail/postgis-commits/2007-June/000074.ht
>>> ml.
>>> In short, the old function names are deprecated, and new applications should
>>> start to use the ST_ prefix functions instead.
>>> 
>>> 
>>> ATB,
>>> 
>>> Mark.
>>> 
>>> --
>>> ILande - Open Source Consultancy
>>> http://www.ilande.co.uk
>>> 
>>> 
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>> 
>> 
> 
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