Defines whether or not the Association shows any directionality with an arrowhead.
The default is None (no arrowhead).
A value of One means that the arrowhead SHALL be at the Target Object.
A value of Both means that there SHALL be an arrowhead at both ends of the Association line.
Returns the enum constant of this type with the specified name.
The string must match exactly an identifier used to declare an
enum constant in this type. (Extraneous whitespace characters are
name - the name of the enum constant to be returned.