code: function UMLAssociation() {
          UMLUndirectedRelationship.apply(this, arguments);
  
          /** @member {UMLAssociationEnd} */
          this.end1 = new UMLAssociationEnd();
          this.end1._parent = this;
  
          /** @member {UMLAssociationEnd} */
          this.end2 = new UMLAssociationEnd();
          this.end2._parent = this;
  
          /** @member {boolean} */
          this.isDerived = false;
      }
docs: UMLAssociation
  @constructor
  @extends UMLUndirectedRelationship