Before seeing how to create a new geometry is necessary to understand the type and subtype concept. Depending on the geometric characteristics, a geometry will be of one type or other. Some types defined on gvSIG are:

• Point: for geometries of point type.
• Curve: for geometries of line type.
• Surface: for geometries of polygon type.
• Arc: for geometries of arc type.
• etc.

All the types gvSIG supports currently are in TYPES in code form. If at any time somebody needs to create a new geometry that don't use any type on the list, he must contact with the gvSIG's team to assign a new code to the type, because it must be unique.

The type only refers to the type of the geomatic object, but it doesn't specify if geometry is on 2 or 3 dimensions, or if it supports M coordinate or not. For that, it's created the subtype concept, to indicate the geometry dimension. The gvSIG's subtypes are in SUBTYPES and it's the same than the types: if somebody wants to add a new subtype must contact with gvSIG's team to provide you a new code. In the next list we show several subtypes supported on gvSIG:

• GEOM2D: 2-dimensional geometries.
• GEOM2DZ: 2-dimensional geometries and value for coordenate Z.
• GEOM3D: 3-dimensional geometries.
• GEOM2DM: 2-dimensional geometries and M coordenate.
• GEOM3DM: 3-dimensional geometries and M coordenate.