I've started to draft a "macedir.org-based" spec for this. It is based on the IETF Internet-Drafts format in anticipation of future work. This approach (to reuse the I-D format) is common in the "open" standards game. The source is all up on github: https://github.com/leifj/macedir-entity-category
. Here is how to produce html and txt version:
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