To clarify what Matzon said. GL11 has the 1.1 API. 1.2 only has the new stuff added in 1.2 version.
So if you want to use all of say version 2.0 then you would be importing GL11, GL12, GL13, etc.
The whole of LJWGL is like this. Say you want to use the multi-texture extension. Then you import ARBMultitexture.