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<TITLE>RE: [postgis-devel] SVN trunk parser modifications stage 2</TITLE>
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<P><FONT SIZE=2>> Right, if the default behavior is not to validate, then it will load<BR>
> just fine. But I have been assuming that the default behavior will be<BR>
> to validate, since all of Mark's comments point in this direction:<BR>
<BR>
On 2008-10-20, Mark Cave-Ayland wrote:<BR>
> 0 - No checking; all checks are disabled<BR>
> 1 - OGC level checking; check for minimum numbers of points and<BR>
> closure of polygons<BR>
> 2 - GEOS level validation; check input geometries are valid as<BR>
> per the GEOS IsValid() function<BR>
><BR>
> The first time the parser/unparser is invoked then we check to see if<BR>
> this setting is present; if it is then the current parser check level is<BR>
> set this value. Otherwise a default value of 1 is chosen.<BR>
<BR>
Hmm I interpreted that to mean 1 is the current non-breaking behavior which is mild checking for non-closed rings etc.. <BR>
For example if I were to stuff this in<BR>
<BR>
SELECT ST_GeomFromEWKT('POLYGON((1 2 3, 4 5 6, 2 3 4))')<BR>
<BR>
Even in current installs it would not load. So the 0 is actually a new feature - where we let true aliens such as the above into the mixture.<BR>
<BR>
I was thinking of overloading instead of GeomFrom..WithStrict, because I figured first pass around<BR>
we will not be able to control at the GUC level because of Mark's observations, but by overloading we will not be changing interfaces.<BR>
<BR>
So an install with no postgis GUC ability would default the ST_GeomFromEWKT, ST_GeomFromEWKB to (hmm I guess 1) or use the overloaded functions to force stricter or less strict behavior and one with GUC ability later on would be<BR>
able to read default from GUC instead of assuming 1.<BR>
<BR>
Hope that helps,<BR>
Regina<BR>
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