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when i say "john knows sally", there are several ambiguities. we can solve ambiguities by disambiguating. one way to disambiguate is to be explicit about what any term or symbol means. one way to be explicit is to use uniform identifiers.

in particular, http/https uris have some convenient properties

- they have authority, so you can qualify an id based on who's assigning it.
- you can use the authority component as a namespace
- you can fetch the uri and it might return something useful

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