docs: protected Tree<FeatureStructure> populateTree(JCas jcas) {
  		Tree<FeatureStructure> tree = new Tree<FeatureStructure>(jcas.getDocumentAnnotationFs());
  		for (TOP a : JCasUtil.select(jcas, annotationTypes.get(0))) {
  			tree.add(populateTree(jcas, a, 1));
  		}
  		return tree;
  
  	}