Recommended Reading:
gml:CircleByCenterPoint
gml:Curve
gml:Envelope
gml:exterior
gml:interior
gml:LinearRing
gml:LineString
gml:lowerCorner
gml:Point
gml:pointProperty
gml:Polygon
gml:pos
gml:posList
gml:radius
gml:segments
gml:upperCorner
gml:_Curve
gml:_CurveSegment
gml:_GeometricPrimitive
gml:_Geometry
gml:_GML
gml:_Object
gml:_Ring
gml:_Surface
gml:id
gml:AbstractCurveSegmentType
gml:AbstractCurveType
gml:AbstractGeometricPrimitiveType
gml:AbstractGeometryType
gml:AbstractGMLType
gml:AbstractRingPropertyType
gml:AbstractRingType
gml:AbstractSurfaceType
gml:CircleByCenterPointType
gml:CurveSegmentArrayPropertyType
gml:CurveType
gml:DirectPositionListType
gml:DirectPositionType
gml:EnvelopeType
gml:LengthType
gml:LinearRingType
gml:LineStringType
gml:MeasureType
gml:PointPropertyType
gml:PointType
gml:PolygonType
gml:CurveInterpolationType
gml:doubleList
gml:NCNameList
gml:StandardObjectProperties
gml:AssociationAttributeGroup
gml:SRSInformationGroup
gml:SRSReferenceGroup