what is a valid PROV extension?

Greetings,

simple and naive question: is there (or should there be) any validation or even “certification” process for PROV extensions? Can anyone who designs an extension claim to have done so correctly with impunity? In fact, should there be a repository of “official” extensions (if that has any meaning give the above)?

Thanks,
  -Paolo



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Dr. Paolo Missier   — Lecturer, Data and Information Management               Home: http://www.cs.ncl.ac.uk/people/Paolo.Missier
Paolo.Missier@newcastle.ac.uk, pmissier@acm.org                                         Twitter:https://twitter.com/PMissier
School of Computing Science, Newcastle University,  UK                                   LinkedIn: http://uk.linkedin.com/pub/paolo-missier
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