private void extractProcess(final TreeNode parent, final Process mainProcess) {
addChildNode(DiagramTreeNodeFactory.createProcessNode(parent, mainProcess));
}
private void extractTransparentProcess(final TreeNode parent, final Process mainProcess) {
final TreeNode transparentProcessNode = DiagramTreeNodeFactory.createTransparentProcessNode(parent, mainProcess);
referenceChildNodesToOwnChildren(transparentProcessNode);
}