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ADR-0012: Unify SVG types to inline-only representation

Status: accepted | Date: 2026-02-19

References: ADR-0011, RFC-0009

Context

SVG handling was previously unified to inline-only representation to simplify legacy IR shape and align with the then-current image pattern.

The current semantic IR baseline is defined by RFC-0009, which introduces explicit math nodes and document-root semantics. This ADR is retained as historical implementation context, but normative IR modeling now follows RFC-0009.

Decision

Keep this ADR as an accepted historical record of the legacy SVG unification step.

For ongoing and future implementation work, treat RFC-0009 as normative and model math/embedded equation content using explicit semantic math nodes rather than SVG-only structural conventions.

Consequences

Positive:

  • Preserves traceability of why legacy code paths treat SVG as inline-first.
  • Removes normative ambiguity by making RFC-0009 the active source of truth.

Negative:

  • Legacy adapter helpers that infer block math from SVG wrappers are transitional and should be phased out under the RFC-0009 migration plan.

Neutral:

  • Historical behavior remains documented without constraining v2 semantic IR design.