I'm about to start working on support for JAX-RS 2.0 in JBoss Tools, and I was wondering if anyone had previous experience with dealing with multiple versions of a spec in Eclipse plugins.

Would you recommend splitting the support in several plugins (1 plugin per version) or all in one ? 

In any case, how do you handle validation for a given version of a specification, for example (amongst other concerns) ?

All input is welcome ;-)

Thanks in advance.