[smufl-discuss] Request for comments on classes JSON file

[dspreadbury]

One of the remaining tasks blocking a stable 1.0 release is the creation
of the promised classes JSON file. I've now put together a classes file
and I'd like to solicit the feedback of the community in advance of the
next release (0.9), the distribution for which will include the
classes.json file for the first time.

The purpose of the classes file is to provide useful groups of glyphs for
consuming applications. Classes are entirely optional, so it is not
required that a glyph should be in any class. Likewise, glyphs can be in
multiple classes. Consuming applications can choose to use the classes
metadata to help work out how to handle different glyphs within a
SMuFL-compliant font.

You can download a preliminary classes.json file from the following URL:

http://www.smufl.org/files/classes-0.84.zip

The classes included in the preliminary file are as follows:

combiningStaffPositions
        Contains glyphs that are available in ligatures with the
"combining staff position" glyphs, in fonts intended for use in text-based
applications. (N.B. not implemented in the current Bravura font, which is
intended for scoring applications.)
 
forTextBasedApplications
        Contains glyphs that scoring applications can generally ignore,
i.e. these are useful for text-based applications (or for runs of normal
text in scoring applications). This contains glyphs like the "Beamed
groups of notes" range, pre-composed stems, pre-composed staff lines, etc.

stemDecorations
        Contains glyphs that are designed to be positioned on stems. This
is a useful class, because the individual glyphs that are intended to be
drawn on stems are dotted around various ranges.

multiGlyphForms
        Contains all glyphs that are designed to be used in combination to
produce larger forms, e.g. ornaments, wiggly lines, etc.

wigglesQuasiRandom
wigglesVibratoVariable
wigglesCircularMotion
wigglesVibrato
wigglesArpeggiato
wigglesArpeggiatoDown
wigglesArpeggiatoUp
wigglesTrill
        These classes contain useful subsets of the "Multi-segment lines"
range.

ornaments
        Contains all pre-composed ornament glyphs, excluding the component
parts in the "Combining strokes for trills and mordents" range.

rests
        Contains all rests glyphs.

pauses
        Contains all fermatas/caesuras, regardless of whether they are
intended to be positioned above or below the note/staff.

pausesBelow
pausesAbove
        Contains only those fermatas that are positioned either above or
below the note/staff, as appropriate.

articulations
        Contains all articulations, regardless of whether they are
intended to be positioned above or below the note/staff.

articulationsBelow
articulationsAbove
        Contains only those articulations that are positioned either above
or below the note/staff, as appropriate.

accidentals
        Contains all glyphs in all accidentals ranges.

accidentalsPersian
accidentals53EDOTurkish
accidentalsAEU
accidentals72EDOWyschnegradsky
accidentalsSagittalDiacritics
accidentalsSagittalPromethean
accidentalsSagittalTrojan
accidentalsSagittalAthenian
accidentalsSagittalPure
accidentalsSagittalMixed
accidentalsHelmholtzEllis
accidentalsJohnston
accidentalsSims
accidentalsSteinZimmermann
accidentals24EDOArrows
accidentalsStandard
        These classes contain useful subsets of accidentals, each class
essentially providing all of the accidentals glyphs required for a given
convention or system.

noteheads
        Contains all glyphs in all noteheads ranges.

noteheadSetSacredHarp
noteheadSetNamesPitch
noteheadSetNamesSolfege
noteheadSetSquare
noteheadSetRoundSmall
noteheadSetRoundLarge
noteheadSetSlashHorizontalEnds
noteheadSetSlashVerticalEnds
parenthesesNotehead
noteheadSetHeavyX
noteheadSetLargeArrowDown
noteheadSetLargeArrowUp
noteheadSetCircled
noteheadSetDiamondOld
noteheadSetDiamond
noteheadSetSlashed2
noteheadSetSlashed1
noteheadSetTriangleDown
noteheadSetTriangleRight
noteheadSetTriangleLeft
noteheadSetTriangleUp
noteheadSetWithX
noteheadSetCircleX
noteheadSetPlus
noteheadSetX
noteheadSetDefault
        These classes contain useful subsets of noteheads, each class
providing a set of noteheads, e.g. the notehead to be used for quarter
notes and shorter, for half notes, for whole notes, etc., for different
conventions.

Are these classes useful? Are there any other obvious classes that should
be included?

Thanks in advance for your feedback,

Daniel

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Phone: [phone] | Fax: [phone] | www.steinberg.net
President / Managing Director: Andreas Stelling
Managing Director: Kazunori Kobayashi, Hiroshi Sasaki
Registration Court: Hamburg HRB 86534
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