[postgis-users] custom data type on basis of 3d geometry type?

[B. Schoen]

Hello everyone,

I was wondering whether postGIS has the option of building a custom data type on top of an existing data type, like a 3d geometry type. In postgreSQL you can build a custom data type on top of an existing one, but I cannot find any examples for postGIS. 

Could anyone please clarify this issue to me or point me into the right direction.

Thanks a mill,
B.
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