==== Notes ====
Any complementary information regarding a specifications defining the feature. For examples, we have cases where a specification contradict another. We need to be able to specified which one is the relevant one (DOM specifications are a good example of this). We also have cases of multiple specification for a single feature where it can be relevant to have some indication of the scope of each individual piece of definition. As there can be many surprising cases, those notes just need to be raw material.
'''NOTE:''' ''Those notes must be localisable.''