def get_ot_study_info_from_nexml(src=None,
                                 nexml_content=None,
                                 encoding=u'utf8',
                                 nexson_syntax_version=DEFAULT_NEXSON_VERSION):
    """Converts an XML doc to JSON using the honeybadgerfish convention (see to_honeybadgerfish_dict)
    and then prunes elements not used by open tree of life study curartion.

    If nexml_content is provided, it is interpreted as the contents
    of an NeXML file in utf-8 encoding.

    If nexml_content is None, then the src arg will be used src can be either:
        * a file_object, or
        * a string
    If `src` is a string then it will be treated as a filepath unless it
        begins with http:// or https:// (in which case it will be downloaded
        using peyotl.utility.download)
    Returns a dictionary with the keys/values encoded according to the honeybadgerfish convention
    See https://github.com/OpenTreeOfLife/api.opentreeoflife.org/wiki/HoneyBadgerFish

    Currently:
        removes nexml/characters @TODO: should replace it with a URI for
            where the removed character data can be found.
    """
    if _is_by_id_hbf(nexson_syntax_version):
        nsv = DIRECT_HONEY_BADGERFISH
    else:
        nsv = nexson_syntax_version
    if nexml_content is None:
        if is_str_type(src):
            if src.startswith('http://') or src.startswith('https://'):
                from peyotl.utility import download
                nexml_content = download(url=src, encoding=encoding)
                nexml_content = nexml_content.encode('utf-8')
            else:
                with codecs.open(src, 'r', encoding=encoding) as src:
                    nexml_content = src.read().encode('utf-8')
        else:
            nexml_content = src.read().encode('utf-8')
    doc = xml.dom.minidom.parseString(nexml_content)
    doc_root = doc.documentElement

    ccfg = ConversionConfig(output_format=nsv, input_format=NEXML_NEXSON_VERSION)
    converter = Nexml2Nexson(ccfg)
    o = converter.convert(doc_root)
    if _is_by_id_hbf(nexson_syntax_version):
        o = convert_nexson_format(o, BY_ID_HONEY_BADGERFISH, current_format=nsv)
    if 'nex:nexml' in o:
        n = o['nex:nexml']
        del o['nex:nexml']
        o['nexml'] = n
    return o