A content model reads groups and claims a trailing node

SPEC-186 D1 and D3: a field may be a group, which matches all of its required members in order or takes nothing; and a field may claim its container's last node with position: last.

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Criteria completion

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Relationships

ID:SPEC-186Status:accepted

A content model reads groups, nested blocks and trailing parts, and reports what is missing

ID:v0.47.0Status:active

v0.47.0 — Quotations and the content model

ID:WORK-695Status:done

Section's header grammar is declared, and the hand-written reader goes

Priority:mediumComplexity:moderateMilestone:v0.47.0

ID:WORK-697Status:done

Pullquote is the featured quotation, with its attribution

Priority:mediumComplexity:complexMilestone:v0.47.0

ID:WORK-699Status:done

An attribution inside a blockquote is read as its last line

Priority:mediumComplexity:moderateMilestone:v0.47.0

main current done

claude/milestone-v0-44-0-ism7ni done changeset-release/main done main done

Acceptance Criteria

A group matches when its required members match in order, takes nothing otherwise, and leaves the nodes it looked at for the next field (D1.1)
Group members may be optional; a group may be required or optional and may contain groups; member names resolve flat and must be unique across the model (D1.2–D1.4)
position: last reserves the container's last node when the field matches it, the fields before it reading the rest, and reserves nothing otherwise (D3)
At most one position: last field per model, and only as its last field; anything else is rejected at load
Composition definitions accept group and position: last, with load-time errors documented in the composed-runes guide (D6)

References

SPEC-186: D1, D3, D6.

Resolution

Completed: 2026-11-02

Branch: claude/milestone-v0-44-0-ism7ni

What was done

packages/types/src/content-model.ts: ContentFieldDefinition.group and position: 'last'.
packages/runes/src/lib/resolver.ts:
- takeField, the single-field step factored out of resolveSequence with no change in behaviour;
- takeGroup, which matches all-or-nothing, handles optional members and nested groups, and resolves members flat with the group's name set to true;
- resolveSequence reserves the last significant node for a position: last field.
packages/runes/src/lib/composition.ts:
- FIELD_KEYS gains group and position;
- parseFields parses groups recursively;
- checkModelFields runs per top-level field list, with the codes content-group-invalid, content-field-duplicate and content-position-invalid;
- slotFields flattens group members into slots.
packages/runes/src/reference.ts: serialises and renders groups and position: last.
packages/runes/test/content-model-groups.test.ts.
Composed-runes guide: the "Groups" and "position: last" sections, and the three Errors rows.

Notes

A required group that fails takes nothing and drops nothing, which is D4.2's rule ahead of WORK-694. A required plain field still drops and reports its child until WORK-694 changes that.
The load checks run for composition definitions. Native code models are not checked; the resolver honours position: last only on the last field.