def METHOD_NAME(item):
    """ Returns the ChEBI ID from element.
    :param item: sbml object
    :type item: SBase
    :return: first chebi id in rdf annotations, None if no chebi annotation
    :rtype: str
    """
    uris = getResourceUris(item)
    chebiMatches = (re.match('.*(CHEBI:\d+)', uri) for uri in uris)
    chebiIds = [match.group(1) for match in chebiMatches if match]
    if len(chebiIds) > 0:
        return chebiIds[0]
    else:
        return None