tegwick
a12e1c4370
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Assistant: claude-code Assistant-Model: opus Assistant-Process: 252470@bnt-lap001 Assistant-Session: ad628c8f-4be2-4979-94c9-76c7ed6f8241
62 lines
2.1 KiB
ABNF
62 lines
2.1 KiB
ABNF
; Mail Address Semantics (MAS) v0.2 (draft)
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; The canonical grammar is unchanged from v0.1.1. The v0.2 stand-ins
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; ("--" for "=", "---" for "!") are not canonical syntax: they parse as
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; opaque targets and are interpreted only by statute-aware
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; implementations (SPECIFICATION section 6.3).
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; Canonical ASCII local-part grammar
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;
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; This grammar describes the local-part only. Domain syntax is provided by
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; the underlying email specifications.
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;
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; P1 accepts: target [facet]
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; P2 accepts: target [facet] [interaction]
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;
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; Generators MUST NOT emit both facet and interaction in v0.1 even though
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; P2 parsers accept the combined canonical form.
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mas-local-p1 = target [facet]
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mas-local-p2 = target [facet] [interaction]
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target = resource-target / opaque-target
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resource-target = resource-type "=" resource-id
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opaque-target = dot-string
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; v0.1.1 (SCP-2): lower-case words joined by single "-" or "_".
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; Never upper case, never "--", "__" or a leading/trailing separator.
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resource-type = type-word *(("-" / "_") type-word)
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type-word = 1*(LCALPHA / DIGIT)
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; Resource identifiers may contain additional "=" characters as data.
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resource-id = resource-id-segment *("." resource-id-segment)
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resource-id-segment = resource-id-char *resource-id-char
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facet = "+" value
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interaction = "!" value
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value = value-segment *("." value-segment)
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value-segment = value-char *value-char
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; dot-string prevents leading, trailing, or repeated ".".
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dot-string = atom *("." atom)
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atom = atom-char *atom-char
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; Conservative canonical ASCII subset derived from RFC 5322 atext while
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; reserving MAS operators + ! $ ^ and "=" where structural.
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;
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; ALPHA / DIGIT are imported from RFC 5234 core rules.
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atom-char = ALPHA / DIGIT /
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"#" / "%" / "&" / "'" / "*" / "-" / "/" / "?" /
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"_" / "`" / "{" / "|" / "}" / "~"
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LCALPHA = %x61-7A ; a-z
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resource-id-char = atom-char / "="
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value-char = atom-char / "="
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; Explicitly excluded from canonical values:
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; "+" "!" "$" "^" "@"
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;
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; Quoted local-parts are outside canonical MAS v0.1.
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; SMTPUTF8 local-parts are outside canonical MAS v0.1 machine grammar.
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