Nothing you say is necessarily the case, and is dependent on implementation. Take "value is just always equal to true", well, no, not if your key is a predicate

Nothing you say is necessarily the case, and is dependent on implementation. Take "value is just always equal to true", well, no, not if your key is a predicate. "Color:red" is more powerful than "#red" or "red:true", and "color:[lookup-ID-for-red-concept]" is substantially more powerful than both.