Changelog

All notable changes to the Podscript specification are recorded here. The spec follows Semantic Versioning (MAJOR.MINOR.PATCH, SPEC §20): a change that alters the meaning of an existing valid script or any golden conformance fixture is major; additive, backward-compatible features are minor; clarifications are patch. Scripts declare the lowest version whose features they use (§1.2).

0.2.0 — 2026-07-03

Added

• Prosody model (SPEC §5.5). A prosody control for speaking delivery — the continuous attributes rate (tempo multiplier), pitch (semitone shift), and volume (vocal-intensity multiplier) — as a per-voice baseline object (§2.3) and a per-line cue clause (§5), merged per attribute onto the IR clip (§11.1) and omitted at natural defaults. The section maps the remaining prosodic dimensions onto existing constructs (*emphasis*, breaks, sentence punctuation, (direction)).
• New SEMITONES token (§1.5); AST Voice.prosody, Prosody interface, and prosody clause variant (§10); IR-clip prosody (§11).
• Prosody is advisory synthesis guidance — a deliberate exception to fail-closed (§15.4): core vocabulary, but engines drop attributes they cannot honour, degrading expressiveness not mix correctness. It joins the synthesis cache key (§14.3) and does not affect timing/resolution.
• Conformance fixtures conformance/parse/prosody and conformance/resolve/prosody; runnable example examples/prosody.podscript.

Changed

• Adopted three-part semantic-version stamps (MAJOR.MINOR.PATCH; PATCH optional, defaults to 0, §1.2). Normalized every bundled example and conformance-fixture stamp from 0.1 to 0.2.0 so the repository uses one consistent current version — a one-time pre-1.0 housekeeping step. Two-part 0.1 stamps remain valid input (0.1 ≡ 0.1.0).

Compatibility

• The prosody feature is additive and backward-compatible at the language level: prosody is omitted when absent, and a 0.1 script parses unchanged under a 0.2.0 engine. The version stamps in the bundled examples and golden fixtures were re-stamped to 0.2.0 as part of the semver normalization above — a housekeeping change to the stamp only, not a semantic change to any script’s meaning.

0.1.0 — 2026-06-24

Added

• Initial public draft: lexical grammar; meta / voices / assets / pronounce headers; speech lines with typed inline content (emphasis, breaks, pronunciation); clauses (anchors, gain, fade, crossfade, duck-under, at, loop); the relational timing model and speech spine; the resolved IR schema; the gain model; determinism and the render manifest; extensibility (namespaced extensions, fail-closed); security; and transcript export.