RFC 5137: ASCII Escaping of Unicode Characters

There are a number of circumstances in which an escape mechanism is needed in conjunction with a protocol to encode characters that cannot be represented or…

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Outgoing relationships (1 related RFC)

Normative reference — RFC 5234: Augmented BNF for Syntax Specifications: ABNF

Incoming relationships (2 related RFCs)

Normatively referenced by — RFC 5284: User-Defined Errors for RSVP
Informatively referenced by — RFC 6365: Terminology Used in Internationalization in the IETF