this.constraintsLogic = rel.constraintsLogic;
    public Relation(Relation rel) {        this.ownType = rel.ownType;        this.otherType = rel.otherType;        this.propName = rel.propName;        this.columnName = rel.columnName;        this.reftype = rel.reftype;        this.constraints = rel.constraints;        this.accessName = rel.accessName;        this.maxSize = rel.maxSize;    }