WORK-647
ID:WORK-647Status:done

Compositions accept implicitSection on a sections model

implicitSection exists on the sections model (packages/types/src/content-model.ts): when no section heading is found, all children become one section instead of preamble. The composition parser does not accept the key, so itinerary, whose conditional content model only exists to add it, cannot be expressed. Accepting it removes that rune's need for a conditional model (SPEC-169 D2, D3).

Priority:mediumComplexity:simpleMilestone:v0.42.0Source:SPEC-169
claude/v0-42-0-planning-t31f5e View source

Criteria completion

Criteria completion: 4 of 4 (100%) checked; tracking started on Oct 25, no incremental history yet0%25%50%75%100%Oct 25Oct 28

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Relationships

Implements 1
Related 3
Branches 3
claude/v0-42-0-planning-t31f5e current done
changeset-release/main donemain doneclaude/v0-42-0-planning-ata7nd ready
History 2
  1. 4606953
    Created (done)by bjornolofandersson
  2. abc833f
    Content editedby Claude
    plan: v0.41.3, v0.42.0 and v0.43.0 milestones

Acceptance Criteria

  • A composition accepts implicitSection on a sections model, and its attribute keys must equal emitAttributes' keys, with an error naming the mismatch otherwise
  • With no section heading, all content becomes one item of the sections slot, and $each is bound the same way as for a real section, asserted in a test
  • The error for a conditional content model names SPEC-169's alternatives: implicit sections, list each and templates
  • The composed-runes guide documents implicitSection

Approach

  • In a composition there is no emitTag, so the implicit section is an ordinary item of the sections slot and its attributes supply the $each values (D3).
  • The error text for a conditional model is shared with WORK-648's and D5's alternatives. D5 (templates covering several values) waits on SPEC-168's templates; name it in the message only once it exists, or phrase the message so it does not promise it.

References

  • SPEC-169: D2, D3.

Resolution

Completed: 2026-10-25

Branch: claude/v0-42-0-planning-t31f5e

What was done

  • packages/runes/src/lib/resolver.ts: one implicitSection() path. Without emitTag, it now returns a section entry (body resolved by sectionModel, declared attributes under IMPLICIT_SECTION_KEY). The emitTag path is unchanged.
  • composition.ts: parses implicitSection, and checkImplicitSection requires its keys to equal emitAttributes' (implicit-section-mismatch). itemsOf binds $each from the implicit attributes. The conditional-model error names the alternatives without promising D5's templates.
  • Guide section on implicitSection; tests in composition-models.test.ts.