UmlNode node2) {
conn.setNode1(node1);
conn.setNode2(node2);
node1.addConnection(conn);
node2.addConnection(conn);
Relation relation = (Relation) conn.getModelElement();
if (relation != null) {
relation.setElement1(node1.getModelElement());
relation.setElement2(node2.getModelElement());
}
}