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Table 1 Some 'rules' for adding vocabulary terms and metadata tokens to a vocabulary hierarchy.

From: New concepts for building vocabulary for cell image ontologies

Ideally, new terms will...
   ... be added only if they are required for a semantic query.
   ... be placed within root categories under which they logically belong.
   ... create new root categories only when required.
   ... be short words or phrases to facilitate sharing between databases.
   ... be substantially different from existing terms (e.g., cell line = cell_line = cellline).
   ... consider terminology from existing ontologies or vocabulary structures.
   ... be subject to change if another highly reused synonym is identified.