There are two revisions of version 1.0:

Revision 1 is stable. It includes only point and box primitives.

Revision 2 contains a more complete set of primitives, and takes the form of port of the geometric part of SVG to RDF.

The term revision is used here to describe a change that adds to a vocabulary without changing the meaning of preexisting terms. Revisions do not require use of a new URI for the vocabulary.