The bundle is documented as a standalone format rather than as a note
between two programs: producers and consumers are generic, the marker
vocabulary is defined musically rather than by what a viewer does with
it, and image properties are stated as guarantees with the reasoning
where it is not obvious. Anything that reads scores can implement it
without knowing this tool exists.
Taking that view changed the substance in three places. Marker types now
carry their musical meaning rather than a UI mapping. The rule against
re-importing became a statement about identity - indices mean something
only within one bundle, so two bundles of a piece are independent
documents. And forward-compatibility rules were added, which a protocol
needs and a handover note did not: ignore unknown fields and marker
types, refuse an unknown version.
Tempo is now an integer, beats per minute, exported as a JSON number and
omitted when blank; the editor accepts digits only. A figure can drive a
metronome or a click track where a verbal marking cannot, and readers do
not agree on what Andante means. This needs the consumer's column
changed from free-form text, which the format document flags.
Every figure in the document comes from a real export.
The project file existed to persist state, so a future reader finding
the exported flag would otherwise re-litigate it. The ADR states plainly
that this reverses an earlier decision, what the original reasoning was,
and what changed in use.
ADR 0002 deferred the SVG renderer partly because re-export made it free
to add later. That no longer holds, so its 'not stranded' bullet is
struck through and pointed at ADR 0007 rather than left standing to
mislead whoever revisits the SVG question.
The handoff was written as a message to relay information; several
decisions lived only there. Split into permanent homes:
- docs/spec.md — scope, geometry model, pipeline order, detection,
levels, editor, project file, markers, bundle format, noteman's
changes, reference values
- ADR 0002 — raster only in release 1; SVG slices measured at 40x WebP
naive, 2.6x with a bounding-box cull, deferred on risk not size
- ADR 0003 — lossless WebP with levels and 16-level alpha; every lossy
option and alternative format measured larger for line art
- ADR 0004 — detection proposes, the human disposes; no unattended mode
- ADR 0005 — PyMuPDF for all PDF access, accepting AGPL
- ADR 0006 — systems are found by vertical brackets, not row-darkness
gaps, which miscount every page of a 6-voice score
Also from testing against the hardest score in the repertoire: scanned
PDFs carry their scan as an embedded image and must be extracted at
native resolution rather than re-rendered at 600 DPI, and per-page
deskew is mandatory (skew varies -2.6 to +1.2 within one PDF).
Esa Kataja