Note record format, used by Tomboy

    "_id": "id_of_this_document", # internal to CouchDB
    "_rev": "revision_for_this_document", #internal to CouchDB
    "record_type": "",
    "record_type_version": "1.0",
    "title": "<note's title>",
    "content": "<note content>", # in HTML/XML format, whatever is specified in the note_format field
    "note_format": string, either "xml" or "html" to identify the format the note's content is in
    "last_change_date": "<last modification date, in UTC>",
    "create_date": "<creation date in UTC>",
    "application_annotations": {
        "Tomboy": {
            ...stuff specific to applications, nobody should rely on these...