Ensure compatibility with A. Rebelo's classes.

[hajicj]

Symbol classes in A. Rebelo's thesis:

• [ ] Breve

• [x] Semibreve (whole note) (= notehead-empty)

• [x] Notes (isolated quarter-notes, plus notes in beamed groups) (= notehead-full+stem)

• [x] NotesOpen (half-note, basically) (= notehead-empty + stem)

• [x] NotesFlag (8th note, 16th note, etc.) (= notehead-full + stem + X_flag)

• [x] Beam (not counting individual beams?) (= beam)

• [x] Dots (= duration-dot)

• [x] Sharp (= sharp)

• [x] Natural (= natural)

• [x] Flat (= flat)

• [x] Staccato (= staccato-dot)

• [ ] Staccatisimo

• [x] Dynamic accent (= accent)

• [x] Fermata (= fermata)

• [x] Tenuto (= tenuto)

• [x] Marcato (= strong_accent)

• [ ] Stopped (currently falls under instrument_specific)

• [ ] Harmonic (currently falls under instrument_specific)

• [ ] Mordent (currently falls under ornament(s))

• [ ] Turn (currently falls under ornament(s))

• [x] Barline (= thin_barline, thick_barline)

• [x] AltoClef (= c-clef)

• [x] BassClef (= f-clef)

• [x] TrebleClef (= g-clef)

• [x] TimeSignatureN (= numeral_X)

• [x] TimeSignatureL (= whole-time_mark, alla_breve)

• [x] Rests1 (quarter) (= quarter_rest)

• [x] Rests2 (8th, 16th, 32nd, 64th, whole, half) (= X_rest)

• [x] Tie (= tie)

• [x] Slur (= slur)

• [x] Glissando (these three are called "Relation") (= glissando)

Note that there are no ledger lines.