[fdo-internals] Request review of RFC 28 - Add Start/EndExpressionFunctions

[Traian Stanev]

Yeah, may be just provide PointX()/PointY()/PointZ() functions which take a geometry as argument and throw an error for anything but points?

Traian

From: fdo-internals-bounces at lists.osgeo.org [mailto:fdo-internals-bounces at lists.osgeo.org] On Behalf Of Dan Stoica
Sent: Monday, November 03, 2008 5:24 PM
To: FDO Internals Mail List
Subject: RE: [fdo-internals] Request review of RFC 28 - Add Start/EndExpressionFunctions

What has the Start point so special except for the point features? For example, the START=END for simple polygons.
Maybe this ECO should address only points?

Dan.

From: fdo-internals-bounces at lists.osgeo.org [mailto:fdo-internals-bounces at lists.osgeo.org] On Behalf Of Greg Boone
Sent: Monday, November 03, 2008 2:53 PM
To: FDO Internals Mail List
Subject: RE: [fdo-internals] Request review of RFC 28 - Add Start/EndExpressionFunctions

Yes, Lines and Polygons do offer some difficulties. Also, the multi-geometry objects are also a little weird. I am open to suggestions on how to handle these types.

Greg

From: fdo-internals-bounces at lists.osgeo.org [mailto:fdo-internals-bounces at lists.osgeo.org] On Behalf Of Jason Birch
Sent: Thursday, October 23, 2008 12:34 PM
To: FDO Internals Mail List
Subject: RE: [fdo-internals] Request review of RFC 28 - Add Start/EndExpressionFunctions

That makes sense to me; I just wasn't sure what you would use the equivalent function for lines/polygons for.

Jason

From: Robert Fortin
Subject: RE: [fdo-internals] Request review of RFC 28 - Add Start/EndExpressionFunctions

The use case: presents the ordinates of a point geometry as attribute in a data table.  This feature will help us achieve that.
You could also think it can be used to display the coordinate as labels as part of the symbology of a feature.
Or you could use the StartZ to show the elevation of a point or apply a theme on it.
All these can't be done easily directly using the geometry attribute.

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