As an initial approximation, I think conventions of usage can be considered to contain three kinds of elements: occasion, purpose, and means. As the statement of means become more and more specific, the convention approaches a convention of the language, a statement about literal meaning. As the connections between purpose and means become obscured, the relation between them is ripe for reinterpretation as entirely arbitrary, at which point the convention of usage is reinterpreted as a convention of the language.
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