[postgis-tickets] [PostGIS] #2938: Patch for gml export of curved geometries

[PostGIS]

#2938: Patch for gml export of curved geometries
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  Reporter:  mhugent  |       Owner:  pramsey      
      Type:  patch    |      Status:  closed       
  Priority:  medium   |   Milestone:  PostGIS 2.1.5
 Component:  postgis  |     Version:  2.1.x        
Resolution:  fixed    |    Keywords:               
----------------------+-----------------------------------------------------

Comment(by rouault):

 I believe this export generates invalid GML that breaks both XML
 validation and OGR GML importer. Child elements of "exterior" can be
 LinearRing or Ring, but not directly curveMember. This is true for both
 GML 3.1.1 and GML 3.2.1. XML validation of

 {{{
 <gml:Polygon xmlns:gml="http://www.opengis.net/gml"
              xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
              xsi:schemaLocation="http://www.opengis.net/gml
 http://schemas.opengis.net/gml/3.1.1/base/gml.xsd">
 <gml:exterior><gml:curveMember><gml:Curve><gml:segments><gml:LineStringSegment><gml:posList
 srsDimension="2">763650.6 189057.1 7636.35 189045.2 763650.549 189057.844
 763650.6
 189057.1</gml:posList></gml:LineStringSegment></gml:segments></gml:Curve></gml:curveMember></gml:exterior></gml:Polygon>
 }}}

 with the xmlvalidate.py utility from mapserver msautotest (based on
 libxml2)

 {{{
 $ python pymod/xmlvalidate.py -ogc_schemas_location
 wxs/SCHEMAS_OPENGIS_NET test.gml
 }}}

 gives

 {{{
 Element '{http://www.opengis.net/gml}curveMember': This element is not
 expected. Expected is one of ( {http://www.opengis.net/gml}_Ring,
 {http://www.opengis.net/gml}LinearRing, {http://www.opengis.net/gml}Ring
 )., line 5
 }}}

 So the right export would be :

 <gml:Polygon><gml:exterior><gml:Ring><gml:curveMember><gml:Curve><gml:segments><gml:LineStringSegment><gml:posList
 srsDimension="2">763650.6 189057.1 7636.35 189045.2 763650.549 189057.844
 763650.6
 189057.1</gml:posList></gml:LineStringSegment></gml:segments></gml:Curve></gml:curveMember></gml:Ring></gml:exterior></gml:Polygon>

-- 
Ticket URL: <http://trac.osgeo.org/postgis/ticket/2938#comment:4>
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