geometryCompact.xsd, part of GML 3.3. Copyright (c) [2011] Open Geospatial Consortium, Inc. To obtain additional rights of use, visit http://www.opengeospatial.org/legal/. A SimplePolygon is a specialized polygon that has a simplified encoding of the logically equivalent GML 3.2 Surface with a single GML 3.2 PolygonPatch as its surface patch consisting of a single LinearRing as its exterior boundary and does not have any interior boundary. Thus the usage of the term 'simple' here refers to a specialized polygon with a _simplified_ encoding, which is _simply_ connected (no interior rings) and uses a _simple_ closed curve (no self-crossings) to represent its single boundary ring. Abstract element representative of a substitution affiliation A SimpleRectangle is the special case of a simple polygon, which has exactly 4 control points in its boundary encoding representing the 4 corners of the rectangle. A SimpleTriangle is the special case of a simple polygon, which has exactly 3 control points in its boundary encoding representing the 3 corners of the triangle. A SimpleArcString is a specialized curve that has a simplified encoding of the logically equivalent GML 3.2 Curve with one or more GML 3.2 Arc segments Abstract element representative of a substitution affiliation A SimpleArc is a specialized curve that has a simplified encoding of the logically equivalent GML 3.2 Curve with a single GML 3.2 ArcString segment . A SimpleArcByCenterPoint is a specialized curve that has a simplified encoding of the logically equivalent GML 3.2 Curve with a single GML 3.2 SimpleArcByCenterPoint segment. A SimpleArcStringByBulge is a specialized curve that has a simplified encoding of the logically equivalent GML 3.2 Curve with one or more GML 3.2 ArcByBulge segments. A SimpleArcStringByBulge is a specialized curve that has a simplified encoding of the logically equivalent GML 3.2 Curve with one GML 3.2 ArcByBulge segment. A SimpleCircle is a specialized curve that has a simplified encoding of the logically equivalent GML 3.2 Curve with a single GML 3.2 Circle segment.