graph { node [shape=plaintext]; "Instrument" [label=<
Instrument
name
family
>]; "Piano" [label=<
Piano
type
>]; "Guitar" [label=<
Guitar
type
>]; "Play" [label=<
Play
#Musician_id
#Instrument_name
event
>]; "Musician" [label=<
Musician
id
name
band
role
>]; "Play":"Musician_id" -- "Musician":__key "Instrument":__key -- ""Play":"Instrument_name" }