Direction type records correspond to subelements of element direction-type.

A direction-type element may have more than one subelement, so each direction_type record belongs to a direction_type_list record using foreign key direction_type_list_id.

direction_type_type is the discriminator column that distinguishes the direction type. Values are:

• rehearsal
• segno
• coda
• words
• symbol
• wedge
• dynamics
• dashes
• bracket
• pedal
• beat metronome
• note metronome
• octave shift
• harp pedals
• damp
• damp all
• eyeglasses
• string mute
• scordatura
• image
• principal voice
• accordion registration
• staff divide
• other direction

Additionally, all percussion element subelements are direction types. Their discriminator values are:

• glass
• metal
• wood
• pitched
• membrane
• effect
• timpani
• beater
• stick
• stick location
• other percussion

As with any other table that uses single inheritance and a discriminator value, any particular type of direction type will only use some of the fields in the table.

All direction types join to display, foreign key display_id. Direction types with text values join to text_format, foreign key text_format_id.

The number attribute value is stored in field direction_type_number.

Dynamics markings for dynamics are in table dynamics_marking, one-to-many foreign key join on dynamics_id.

Dynamics that are a subelement of the notations element are stored as a notation record whose dynamics_id field joins to the direction_type table, where the dynamics values are stored in the same way as dynamics that subelements of direction-type.

A beat metronome has two foreign keys to metronome_mark: metronome_mark_1_id and metronome_mark_2_id.

A note metronome has two lists of metronome_note records. The foreign keys in metronome_note to distinguish these two lists are note_metronome_1_id and note_metronome_2_id.

Pedal tunings for harp pedals are in pedal_tuning, foreign key harp_pedals_id.

Accords for scordatura are in table accord, foreign key scordatura_id.