I dont't have any experience with geographics databases so I hope that you be patiente with me, so I opened this question (PostGis and datatypes WKT) in the past week about the datatypes in the postgis, but later I continued to read the documentation and then I found the following.

What are these datatypes? they are instanciable? and why they aren't here https://github.com/postgis/postgis/blob/svn-trunk/liblwgeom/liblwgeom.h.in#L82 (that link is the link that was used to answer my question that I mencioned on the begining of the question)

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The ST_Geometry type is the maximal supertype of the geometry type hierarchy, ST_Curve and ST_Surface are direct subtypes.

The types you list are further down the line (more specialized). You can create ST_Geometry, ST_Surface and ST_Curve objects directly, as is shown in the ArcGIS documentation.


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