All revisions of LV2 are backwards compatible. Revision 3 (2008-11-08) is the latest.
The core specification consists of a C header, RDF schema in Turtle and some human readable documentation.
A standard source package with all the LV2 specification components is available. Distributions are encouraged to include this package:
The individual components are also available for direct download:
There's a simple amplifier example plugin.
LV2 is extended and enhanced with various extensions that add features not included in the core specification: