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SIP  SIP‑URI  SIP Headers  SIP P‑Headers  SDP  Generic URI  ABNF Notation
URI Reference  Scheme  Authority  Path  Query  Fragment  Characters

Generic Syntax for URI (RFC 3986) — URI Reference

ABNF in Section 3  and  Usage in Section 4

URI-reference =
URI /  relative-ref
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URI =
scheme  ":"  hier-part  [ "?"  query ]  [ "#"  fragment ]
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absolute-URI =
scheme  ":"  hier‑part  [ "?"  query ]
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relative-ref =
relative-part  [ "?"  query ]  [ "#"  fragment ]
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hier-part =
"//"   authority   path‑abempty /  path‑absolute /  path‑rootless /  path‑empty
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relative-part =
"//"   authority   path‑abempty /  path‑absolute /  path‑noscheme /  path‑empty
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