[OpenLayers-Dev] Rule subclasses and 2.6

[Christopher Schmidt]

On Sat, Apr 05, 2008 at 05:52:51PM +0200, Eric Lemoine wrote:
> On Thu, Apr 3, 2008 at 10:21 AM, Andreas Hocevar
> <andreas.hocevar at gmail.com> wrote:
> > Tim-
> >
> >
> >  On Thu, Apr 3, 2008 at 6:14 AM, Tim Schaub <tschaub at openplans.org> wrote:
> >  >  The new style work includes the addition of OpenLayers.Rule and
> >  >  subclasses.  The base Rule class corresponds well to the sld:Rule
> >  >  element in the SLD spec (min/max limits constraints, symbolizers, etc.).
> >  >
> >  >  The subclasses of Rule (Comparison, FeatureId, and Logical) correspond
> >  >  well to ogc:Filter elements in the Filter Encoding specification.
> >  >  Though our Rule subclasses can have a symbolizer, an ogc:Filter knows
> >  >  nothing of a symbolizer - in SLD, an ogc:Filter element is a child of an
> >  >  sld:Rule that has a symbolizer.
> >
> >  To me, a logical step would be to have one Rule class, which has
> >  minScale, maxScale, symbolizer, and a filter property. There would be
> >  a new class OpenLayers.Filter with subclasses with the filter-related
> >  code of the current Rule subclasses. I think that is in line with what
> >  you think.
> >
> >
> >  >  1) Do no mark Rule subclasses as part of the API.  Later, change them so
> >  >  they are Filter subclasses and require that they be added to a Rule
> >  >  (with a symbolizer) for things like styling.  They could also be used
> >  >  alone (without rules) for things like WFS.  This would also require
> >  >  changing the georss-flickr.html example (that uses Rule.Comparison) and
> >  >  the wiki page on styling.
> >
> >  I am in favour of that option. We do not encourage people to touch
> >  rules directly anyway (except for the georss-flickr example).
> 
> I find it a bit weird to show people an example that uses Rule
> subclasses and encourage those same people not to use these
> subclasses.

Yeah, I think that the idea is that we would remove that functionality
from the georss-flickr example, so far as I can tell...

Regards,
-- 
Christopher Schmidt
MetaCarta