6.15 Double-angle quotation (二重山括弧)

Synopsis

A source text (底本) may set a phrase inside twin angle brackets 《…》. Those glyphs (U+300A / U+300B) are exactly the ruby reading markers (§6.1), so an Aozora Bunko transcription cannot write them literally without colliding with ruby. The transcription therefore encodes the quotation as ≪…≫ (U+226A / U+226B) and a processor restores the display form 《…》.

底本 《重要》 → transcription ≪重要≫ → display 《重要》.

Notation

A run delimited by ≪ (U+226A) and ≫ (U+226B):

≪重要≫

angle-quote   = ANGLE-OPEN angle-content ANGLE-CLOSE   ; ≪ … ≫
ANGLE-OPEN    = %x226A                                 ; ≪
ANGLE-CLOSE   = %x226B                                 ; ≫

The delimiters are distinct Unicode scalars from the ruby markers 《/》 (U+300A / U+300B), so this construct never competes with ruby under the leftmost-longest rule (§5.1).

Parameters

content — the quoted run between the delimiters. It MAY contain the same nested inline constructs a ruby reading may (e.g. a gaiji reference), folded the same way (§7).

Semantics

A well-formed ≪content≫ yields an angle-quote node over the run.
Reference rendering (§8) is <span class="aozora-angle-quote">《…》</span>: the processor restores the display brackets 《…》 (U+300A / U+300B) inside the span. The input scalars ≪/≫ are not emitted.
Serialization (§7.6) reconstructs the input form ≪content≫ (U+226A / U+226B), byte-exact; parse ∘ serialize is a fixed point.
An adjacent 《《…》》 in source is not this construct: those are two ruby openers and raise nested-ruby (§9). The double-angle quotation is only ever the distinct ≪…≫ encoding.

Error conditions

Unclosed ≪ — a ≪ with no matching ≫ is handled per unclosed-bracket (error); the region degrades to plain text.
Empty ≪≫ — an empty body produces no node; the bytes degrade to plain text and are not flagged (mirroring a bare 《》).
A stray ≫ with no opener is literal text and is not flagged.

Conformance vectors

angle_quote (under conformance/vectors/).

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