Include controlled vocabularies among the types of vocabularies that are maintained

[baskaufs]

Refer to Issue #18 . I don't think that in principle there is any reason why controlled vocabularies should be treated differently from other vocabularies whose maintenance is described in a Vocabulary Maintenance Specification. One could modify or add to the terms in the vocabulary in the same way we maintain property and class terms in vocabularies such as DwC.

[baskaufs]

I think we decided that controlled vocabularies should be included. In any case, they have been included in the draft document.