Adding support for writing wfs:Query with limited property names. Patch from bartvde, tests and mods from me. r=me,ahocevar. (closes #1827)

git-svn-id: http://svn.openlayers.org/trunk/openlayers@8928 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Format/WFST/v1_1_0.js

@@ -107,12 +107,26 @@ OpenLayers.Format.WFST.v1_1_0 = OpenLayers.Class(
                 if(options.featureNS) {
                     node.setAttribute("xmlns:" + options.featurePrefix, options.featureNS);
                 }
+                if(options.propertyNames) {
+                    for(var i=0,len = options.propertyNames.length; i<len; i++) {
+                        this.writeNode(
+                            "wfs:PropertyName", 
+                            {property: options.propertyNames[i]},
+                            node
+                        );
+                    }
+                }
                 if(options.filter) {
                     this.setFilterProperty(options.filter);
                     this.writeNode("ogc:Filter", options.filter, node);
                 }
                 return node;
-            }
+            },
+            "PropertyName": function(obj) {
+                return this.createElementNSPlus("wfs:PropertyName", {
+                    value: obj.property
+                });
+            }            
         }, OpenLayers.Format.WFST.v1.prototype.writers["wfs"]),
         "gml": OpenLayers.Format.GML.v3.prototype.writers["gml"],
         "feature": OpenLayers.Format.GML.v3.prototype.writers["feature"],