[WFS provider] Do not be confuse by elements that have ref attribute when parsing DescribeFeatureType response; and fix support of (deprecated) ref='gml:XXXXProperty' attributes

Author: rouault

src/providers/wfs/qgswfsprovider.cpp

@@ -1328,7 +1328,12 @@ bool QgsWFSProvider::readAttributesFromSchema( QDomDocument &schemaDoc,
       }
     }
 
+    // attribute ref
+    QString ref = attributeElement.attribute( QStringLiteral( "ref" ) );
+
     QRegExp gmlPT( "gml:(.*)PropertyType" );
+    QRegExp gmlRefProperty( "gml:(.*)Property" );
+
     // gmgml: is Geomedia Web Server
     if ( type == QLatin1String( "gmgml:Polygon_Surface_MultiSurface_CompositeSurfacePropertyType" ) )
     {
@@ -1343,15 +1348,25 @@ bool QgsWFSProvider::readAttributesFromSchema( QDomDocument &schemaDoc,
       geomType = QgsWkbTypes::MultiLineString;
     }
     //is it a geometry attribute?
-    //MH 090428: sometimes the <element> tags for geometry attributes have only attribute ref="gml:polygonProperty" and no name
     // the GeometryAssociationType has been seen in #11785
-    else if ( type.indexOf( gmlPT ) == 0 || type == QLatin1String( "gml:GeometryAssociationType" ) || name.isEmpty() )
+    else if ( type.indexOf( gmlPT ) == 0 || type == QLatin1String( "gml:GeometryAssociationType" ) )
     {
       foundGeometryAttribute = true;
       geometryAttribute = name;
       geomType = geomTypeFromPropertyType( geometryAttribute, gmlPT.cap( 1 ) );
     }
-    else //todo: distinguish between numerical and non-numerical types
+    //MH 090428: sometimes the <element> tags for geometry attributes have only attribute ref="gml:polygonProperty"
+    //Note: this was deprecated with GML3.
+    else if ( ref.indexOf( gmlRefProperty ) == 0 )
+    {
+      foundGeometryAttribute = true;
+      geometryAttribute = ref.mid( 4 ); // Strip gml: prefix
+      QString propertyType( gmlRefProperty.cap( 1 ) );
+      // Set the first character in upper case
+      propertyType = propertyType.left( 1 ).toUpper() + propertyType.mid( 1 );
+      geomType = geomTypeFromPropertyType( geometryAttribute, propertyType );
+    }
+    else if ( !name.isEmpty() ) //todo: distinguish between numerical and non-numerical types
     {
       QVariant::Type  attributeType = QVariant::String; //string is default type
       if ( type.contains( QLatin1String( "double" ), Qt::CaseInsensitive ) || type.contains( QLatin1String( "float" ), Qt::CaseInsensitive ) || type.contains( QLatin1String( "decimal" ), Qt::CaseInsensitive ) )

tests/src/python/test_provider_wfs.py

@@ -119,11 +119,14 @@ def setUpClass(cls):
           <xsd:element maxOccurs="1" minOccurs="0" name="name2" nillable="true" type="xsd:string"/>
           <xsd:element maxOccurs="1" minOccurs="0" name="num_char" nillable="true" type="xsd:string"/>
           <xsd:element maxOccurs="1" minOccurs="0" name="geometryProperty" nillable="true" type="gml:PolygonPropertyType"/>
+          <!-- check that an element with ref without name doesn't confuse the DescribeFeatureType analyzer -->
+          <xsd:element maxOccurs="0" minOccurs="0" ref="my:somethingElseType"/>
         </xsd:sequence>
       </xsd:extension>
     </xsd:complexContent>
   </xsd:complexType>
   <xsd:element name="typename" substitutionGroup="gml:_Feature" type="my:typenameType"/>
+  <xsd:complexType name="somethingElseType"/>
 </xsd:schema>
 """.encode('UTF-8'))
 
@@ -2486,6 +2489,73 @@ def testWFS20TransactionsEnabled(self):
         self.assertNotEqual(vl.dataProvider().capabilities() & vl.dataProvider().EditingCapabilities, vl.dataProvider().NoCapabilities)
         self.assertEqual(vl.wkbType(), QgsWkbTypes.Point)
 
+    def testDeprecatedGML2GeometryDeclaration(self):
+        """Test ref="gml:pointProperty" """
+
+        endpoint = self.__class__.basetestpath + '/fake_qgis_http_endpoint_deprecated_gml2'
+
+        with open(sanitize(endpoint, '?SERVICE=WFS?REQUEST=GetCapabilities?VERSION=1.0.0'), 'wb') as f:
+            f.write("""
+<WFS_Capabilities version="1.0.0" xmlns="http://www.opengis.net/wfs" xmlns:ogc="http://www.opengis.net/ogc">
+  <FeatureTypeList>
+    <FeatureType>
+      <Name>my:typename</Name>
+      <Title>Title</Title>
+      <Abstract>Abstract</Abstract>
+      <SRS>EPSG:32631</SRS>
+      <!-- in WFS 1.0, LatLongBoundingBox is in SRS units, not necessarily lat/long... -->
+      <LatLongBoundingBox minx="400000" miny="5400000" maxx="450000" maxy="5500000"/>
+    </FeatureType>
+  </FeatureTypeList>
+</WFS_Capabilities>""".encode('UTF-8'))
+
+        with open(sanitize(endpoint, '?SERVICE=WFS&REQUEST=DescribeFeatureType&VERSION=1.0.0&TYPENAME=my:typename'), 'wb') as f:
+            f.write("""
+<xsd:schema xmlns:my="http://my" xmlns:gml="http://www.opengis.net/gml" xmlns:xsd="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified" targetNamespace="http://my">
+  <xsd:import namespace="http://www.opengis.net/gml"/>
+  <xsd:complexType name="typenameType">
+    <xsd:complexContent>
+      <xsd:extension base="gml:AbstractFeatureType">
+        <xsd:sequence>
+          <xsd:element maxOccurs="1" minOccurs="0" ref="gml:pointProperty"/>
+          <xsd:element maxOccurs="1" minOccurs="0" name="INTFIELD" nillable="true" type="xsd:int"/>
+        </xsd:sequence>
+      </xsd:extension>
+    </xsd:complexContent>
+  </xsd:complexType>
+  <xsd:element name="typename" substitutionGroup="gml:_Feature" type="my:typenameType"/>
+</xsd:schema>
+""".encode('UTF-8'))
+
+        vl = QgsVectorLayer("url='http://" + endpoint + "' typename='my:typename' version='1.0.0'", 'test', 'WFS')
+        assert vl.isValid()
+        self.assertEqual(vl.wkbType(), QgsWkbTypes.Point)
+        self.assertEqual(len(vl.fields()), 1)
+
+        with open(sanitize(endpoint, '?SERVICE=WFS&REQUEST=GetFeature&VERSION=1.0.0&TYPENAME=my:typename&SRSNAME=EPSG:32631'), 'wb') as f:
+            f.write("""
+<wfs:FeatureCollection
+                       xmlns:wfs="http://www.opengis.net/wfs"
+                       xmlns:gml="http://www.opengis.net/gml"
+                       xmlns:my="http://my">
+  <gml:boundedBy><gml:null>unknown</gml:null></gml:boundedBy>
+  <gml:featureMember>
+    <my:typename fid="typename.0">
+      <gml:pointProperty>
+          <gml:Point srsName="http://www.opengis.net/gml/srs/epsg.xml#4326"><gml:coordinates decimal="." cs="," ts=" ">426858,5427937</gml:coordinates></gml:Point>
+      </gml:pointProperty>
+      <my:INTFIELD>1</my:INTFIELD>
+    </my:typename>
+  </gml:featureMember>
+</wfs:FeatureCollection>""".encode('UTF-8'))
+
+        values = [f['INTFIELD'] for f in vl.getFeatures()]
+        self.assertEqual(values, [1])
+
+        got_f = [f for f in vl.getFeatures()]
+        got = got_f[0].geometry().geometry()
+        self.assertEqual((got.x(), got.y()), (426858.0, 5427937.0))
+
 
 if __name__ == '__main__':
     unittest.main()