string
The graphic primitive identifier type. This signifies what sort of identifier the graphic primitive is treated as in the identifier table (atable). Possible values are “entity” or a gstructure or compound name.
my_circ.class has the value "entity".
entity my_circ = circle -r=100
my_box.class has the value "~test.flowbox".
gstructure ~test.flowbox {
    string name
    numeric width
    numeric height
} # Simple gstructure.
~test.flowbox my_box
my_vess.class has the value "~test.vessel". my_vess.body.class has the value "entity".
compound ~test.vessel {
    entity body
    entity text
} # Compound structure.
~test.vessel my_vess