Addresses

Every tool names an element by one triple: the world’s id, the type word and the element’s id. The address profile writes its three spellings once, so a link copied in one tool opens in another:

Spelling	Form	Use
The human address	https://www.onlyworlds.com/w/<world id>/<type>/<id>	a link to give a person
Inside a world	ow://<type>/<id>	an element named in a text field of the same world
Across worlds	ow://<world id>/<type>/<id>	an element of another world, named in a text field

A world by itself is https://www.onlyworlds.com/w/<world id> or ow://<world id>. An address may end in a moment, @<step> on its last path segment, and a lens, ?lens=<id>. Addresses are written in lowercase and never percent-decoded; a reader refuses what the profile refuses, by the profile’s own reason (uppercase, segments, unknown_type, bad_id and the rest). The TypeScript and Python SDKs carry the reader and the writer (parseOwLink, elementAddress, and their snake-case twins).