return new com.arsdigita.persistence.metadata.JoinElement(from, to);
return new JoinElement(from, to);
    com.arsdigita.persistence.metadata.JoinElement generateLogicalModel() {        com.arsdigita.persistence.metadata.Column from;        com.arsdigita.persistence.metadata.Column to;        from = m_from.generateLogicalModel();        to = m_to.generateLogicalModel();        return new com.arsdigita.persistence.metadata.JoinElement(from, to);    }