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Section 2.1 indicates that user comments a … Section 2.1 indicates that user comments and discussions can be attached to mappings since the mappings are first class objects. This modeling seems restrictive, though, in cases where a researcher might want to discuss a mapping without asserting it. Would adding another form of comments that could reference a ''possible'' mapping be preferable to the situation where a mapping must be asserted in order to be discussed? must be asserted in order to be discussed?
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