2019-11-12 17:39:52 +00:00
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# Protocol Core
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2019-11-12 16:39:24 +00:00
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## Entity ID
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* Room alias: `#<roomAlias>:<serverpart>`
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* Username: `@<username>@<serverpart>`
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* User ID with MSISDN (Mobile Station International Subscriber Directory Number): `%<msisdn without +>:<serverpart>`
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* User ID with Email: `^<email username>_at_<email hostname>:<serverpart>`
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* Message ID: `&<uuid>:<serverpart (from which server the message was sent)>`
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* Room ID: `!<roomID>@<serverpart>`
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* Single server-part: `<serverpart>`
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**Server-part (hostname)** - `IPv4 / [IPv6] / dns-domain:<port (1-65535)>`.
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**Username/Room alias/RoomID** - MUST NOT be empty, and MUST contain only the characters `a-z`, `0-9`, `.`, `_`, `=`, `-`, and `/`.
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RoomID SHOULD be UUID identifier.
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