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<p class=MsoNormal><span style='color:#1F497D'>Hi<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>I have some concerns with the
class capabilities part of the RFC.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>The class capabilities will
introduce the vertex order hint and the strictness setting. Introducing the
vertex order hint will result in many existing SDF files (for example) having
the “wrong” vertex order, since there are many SDF files which started life as
SHP files.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>The above means that having the
vertex order hint is not useful for many SDF files (and also many SHP files
written out by applications which don’t enforce winding order, and also other
formats), and the consuming application will have to fix the vertex order if it
really cares. MapGuide for example does not care – it can render polygons with
any winding you give it. So the vertex order hint seems like it will only add
confusion. An application which does care will have to ignore the vertex order
capability, since it is not really true (as described above). Hence the vertex
order setting is not useful for both applications which do care about vertex
order and for applications which don’t care about it.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>The strictness hint is also problematic.
Most providers will use the “not enforced” setting, which means that you can
still store any kind of polygon in them. In fact only one data source (and not
in all cases) requires strict vertex order – SQL Server. All other cases would
mean per-provider coding of strictness enforcement in case we want “enforced”
vertex order.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>So, if the capability provides
no correct information about vertex order and no meaningful enforcement of
vertex order, is it needed at all?<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Traian<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
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<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
fdo-internals-bounces@lists.osgeo.org
[mailto:fdo-internals-bounces@lists.osgeo.org] <b>On Behalf Of </b>Leaf Li<br>
<b>Sent:</b> Tuesday, July 06, 2010 6:15 AM<br>
<b>To:</b> fdo-internals@lists.osgeo.org<br>
<b>Subject:</b> [fdo-internals] FDO RFC 48 - Polygon Vertex Order is ready for
review.<o:p></o:p></span></p>
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<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>All,<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>FDO RFC 48 - Polygon Vertex Order is ready for review. Can
you review it?<o:p></o:p></p>
<p class=MsoNormal><a href="http://trac.osgeo.org/fdo/wiki/FDORfc48">http://trac.osgeo.org/fdo/wiki/FDORfc48</a><o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Thanks,<o:p></o:p></p>
<p class=MsoNormal>Leaf Li<o:p></o:p></p>
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