throws Exception {
try {
URL modelUrl = new URL(_catalog.getModel(docType));
Node modelRoot = getDocumentTree(modelUrl, "");
URL identityTransfUrl = new URL(Http + "identity.xsl");
Transform tocTransform = getTransform(identityTransfUrl);
TocTree tree = TocTree.makeTocTree(modelRoot, tocTransform, this);
CollectionModel model = new CollectionModel();
model.setTree(tree);
return model;
}