geometryCompact.xsd, part of GML 3.3. Copyright (c) [2011,2018] 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.
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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
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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.