JointKind
Authoring-level role of a :class:Joint in a long note.
STEP is a passed-through waypoint, CONTROL shapes a straight segment, and
CURVE_CONTROL shapes a curved one. Maps to :class:LongAttr on the raw tree.
Attributes
attributeSTEP= 'step'attributeCONTROL= 'control'attributeCURVE_CONTROL= 'curve_control'