public Map<String, Object> walkTree() throws IOException, TikaException, SAXException {
        Map<String, Object> structure = new HashMap<>();
        structure.put("header", oneNoteDocument.header);
        structure.put("rootFileNodes", walkRootFileNodes());
        return structure;
    }
Parse the tree.

@return Map of the fully parsed one note document.
@throws IOException Can throw these when manipulating the seekable byte channel.
tika-parsers/tika-parsers-standard/tika-parsers-standard-modules/tika-parser-microsoft-module/src/main/java/org/apache/tika/parser/microsoft/onenote/OneNoteTreeWalker.java