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<p class=MsoNormal><span style='color:olive'>Guys,<o:p></o:p></span></p>

<p class=MsoNormal><span style='color:olive'><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal><span style='color:olive'>Unless there is standard out
there, we can come up with whatever definition we want as long as it is
consistant and it makes sense.<o:p></o:p></span></p>

<p class=MsoNormal><span style='color:olive'><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal><span style='color:olive'>The RFC proposes the following:<o:p></o:p></span></p>

<p><span lang=EN style='font-size:10.0pt;font-family:"Verdana","sans-serif";
color:black'>If the provided geometry is a point geometry, the result of the
Start/End functions is the x, y, z values of the point.<br>
If the provided geometry is a multi-point geometry, the result of the Start/End
functions is the x, y, z values of the first point.<o:p></o:p></span></p>

<p><span lang=EN style='font-size:10.0pt;font-family:"Verdana","sans-serif";
color:black'>&gt;&gt; I think Start should be referencing the first point and End
the last point in case of multi-point. <o:p></o:p></span></p>

<p><span lang=EN style='font-size:10.0pt;font-family:"Verdana","sans-serif";
color:black'>If the provided geometry is a line geometry, the result of the
Start/End functions is the x, y, z values of the start and end points of the
first line.<br>
If the provided geometry is a multi-line geometry, the result of the Start/End
functions is the x, y, z values of the start and end points of the first line.<o:p></o:p></span></p>

<p><span lang=EN style='font-size:10.0pt;font-family:"Verdana","sans-serif";
color:black'>&gt;&gt; Same here.&nbsp; Start &#8211; first point of first line,
End &#8211; last point of last line.<o:p></o:p></span></p>

<p><span lang=EN style='font-size:10.0pt;font-family:"Verdana","sans-serif";
color:black'>If the provided geometry is a polygon geometry, the result of the
Start/End functions is the x, y, z values of the start and end points of the
exterior ring of the polygon.<br>
If the provided geometry is a multi-polygon geometry, the result of the
Start/End functions is the x, y, z values of the start and end points of the
exterior ring of the first polygon.<o:p></o:p></span></p>

<p><span lang=EN style='font-size:10.0pt;font-family:"Verdana","sans-serif";
color:black'>&gt;&gt; Same again.&nbsp; Start &#8211; first point of first
ring, End &#8211; last point of last ring.<o:p></o:p></span></p>

<p class=MsoNormal><span style='color:olive'>But we all know that it is not
valuable to use those on polygon or circle (which is just an arc) but I don&#8217;t
want the function to throw an error because a polygon geometry is passed as
input. &nbsp;<o:p></o:p></span></p>

<p class=MsoNormal><span style='color:olive'>Let&#8217;s agree on what it
should be and return it.<o:p></o:p></span></p>

<p class=MsoNormal><span style='color:olive'><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal><span style='color:olive'>RF<o:p></o:p></span></p>

<p class=MsoNormal><span style='color:olive'><o:p>&nbsp;</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>Traian
Stanev<br>
<b>Sent:</b> Tuesday, November 04, 2008 3:15 PM<br>
<b>To:</b> FDO Internals Mail List<br>
<b>Subject:</b> RE: [fdo-internals] Request review of RFC 28
-AddStart/EndExpressionFunctions<o:p></o:p></span></p>

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<p class=MsoNormal><o:p>&nbsp;</o:p></p>

<p class=MsoNormal><span style='color:#1F497D'><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal><span style='color:#1F497D'>Moreover, what if the geometry
is a circle? </span><span style='font-family:Wingdings;color:#1F497D'>J</span><span
style='color:#1F497D'><o:p></o:p></span></p>

<p class=MsoNormal><span style='color:#1F497D'><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal><span style='color:#1F497D'><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal><span style='color:#1F497D'><o:p>&nbsp;</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>Dan Stoica<br>
<b>Sent:</b> Tuesday, November 04, 2008 3:14 PM<br>
<b>To:</b> FDO Internals Mail List<br>
<b>Subject:</b> RE: [fdo-internals] Request review of RFC 28
-AddStart/EndExpressionFunctions<o:p></o:p></span></p>

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<p class=MsoNormal><o:p>&nbsp;</o:p></p>

<p class=MsoNormal><span style='color:#1F497D'>Robert, returning to the
original issue:&nbsp; what is the meaning of PointX(geometry,
&#8216;end&#8217;) for a polygon?<o:p></o:p></span></p>

<p class=MsoNormal><span style='color:#1F497D'><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal><span style='color:#1F497D'>Dan.<o:p></o:p></span></p>

<p class=MsoNormal><span style='color:#1F497D'><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal><span style='color:#1F497D'><o:p>&nbsp;</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>Robert Fortin<br>
<b>Sent:</b> Tuesday, November 04, 2008 2:46 PM<br>
<b>To:</b> FDO Internals Mail List<br>
<b>Subject:</b> RE: [fdo-internals] Request review of RFC 28
-AddStart/EndExpressionFunctions<o:p></o:p></span></p>

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<p class=MsoNormal><o:p>&nbsp;</o:p></p>

<p class=MsoNormal><span style='color:#003300'>I think there was plenty of good
idea of how far we can go with these kind of functions.&nbsp; But, trying to go
back to the original issue we were trying to resolve by RFC-28 which is simply
to get the coordinates values for the first and last point&#8230;<o:p></o:p></span></p>

<p class=MsoNormal><span style='color:#003300'><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal><span style='color:#003300'>I think Romy has an interesting
proposal that makes the function evolutive over time and avoid over populating
the list of functions with new names each time we think of a new possibility.
It also makes it clear that it is about the points on the geometry and not
computed point as other functions like MidX or CentroidX would be&nbsp; (but
that a matter for another debate).<o:p></o:p></span></p>

<p class=MsoNormal><span style='color:#003300'><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal><span style='color:#003300'>I was thinking of even
rationalizing it further (by adding another enumeration parameter to indicate
x,y and z &#8211; we forgot about &#8220;m&#8221; by the way!) but I think the
name of the function PointX, PointY and PointZ are just clear enough.<o:p></o:p></span></p>

<p class=MsoNormal><span style='color:#003300'><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal><span style='color:#003300'>Can we go for that as far as the
RFC is concerned?<o:p></o:p></span></p>

<p class=MsoNormal><span style='color:#003300'><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal><span style='color:#003300'>RF<o:p></o:p></span></p>

<p class=MsoNormal><span style='color:#003300'><o:p>&nbsp;</o:p></span></p>

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<p class=MsoNormal><span style='color:#1F497D'><o:p>&nbsp;</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>Romica
Dascalescu<br>
<b>Sent:</b> Tuesday, November 04, 2008 11:27 AM<br>
<b>To:</b> FDO Internals Mail List<br>
<b>Subject:</b> RE: [fdo-internals] Request review of RFC 28
-AddStart/EndExpressionFunctions<o:p></o:p></span></p>

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<p class=MsoNormal><o:p>&nbsp;</o:p></p>

<p class=MsoNormal><span style='color:#1F497D'>Hi,<o:p></o:p></span></p>

<p class=MsoNormal><span style='color:#1F497D'><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal><span style='color:#1F497D'>A different approach is to
create functions which takes a geometry and an enumeration, this way each provider
can implement all cases or just a few of them, e.g.:<o:p></o:p></span></p>

<p class=MsoNormal><span style='color:#1F497D'><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal><span style='color:#1F497D'>PointX(geom, enum)<o:p></o:p></span></p>

<p class=MsoNormal><span style='color:#1F497D'>PointY(geom, enum)<o:p></o:p></span></p>

<p class=MsoNormal><span style='color:#1F497D'>PointZ(geom, enum)<o:p></o:p></span></p>

<p class=MsoNormal><span style='color:#1F497D'><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal><span style='color:#1F497D'>Where enum can be:
&#8216;start&#8217;, &#8216;end&#8217;, &#8216;min&#8217;, &#8216;max&#8217;,
&#8216;centroid&#8217;, &#8230;<o:p></o:p></span></p>

<p class=MsoNormal><span style='color:#1F497D'>For now we may implement just a
few of them (start, end) and in the future we could implement more cases.<o:p></o:p></span></p>

<p class=MsoNormal><span style='color:#1F497D'><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal><span style='color:#1F497D'>Romy.<o:p></o:p></span></p>

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