def main():
    """Define the CLI inteface/commands."""
    arguments = docopt(__doc__)
    cfg_filename = pkg_resources.resource_filename(
        'knowledge_base',
        'config/virtuoso.ini'
    )
    kb = KnowledgeBase(cfg_filename)

    # the user has issued a `find` command
    if arguments["find"]:
        search_string = arguments["<search_string>"]
        try:
            urn = CTS_URN(search_string)
            match = kb.get_resource_by_urn(str(urn))
            show_result(match, verbose=True)
            return
        except BadCtsUrnSyntax as e:
            pass
        except IndexError as e:
            raise e
            print("\nNo records with this CTS URN!\n")
            return
        try:
            matches = kb.search(search_string)
            print("\nSearching for \"%s\" yielded %s results" % (
                search_string,
                len(matches)
            ))
            print_results(matches)
            return
        except SparqlReaderException as e:
            print("\nWildcard word needs at least 4 leading characters")
    # the user has issued an `add` command
    elif arguments["add"]:
        input_urn = arguments["--to"]

        # first let's check if it's a valid URN
        try:
            urn = CTS_URN(input_urn)
        except Exception as e:
            print("The provided URN ({}) is invalid!".format(input_urn))
            return

        try:
            resource = kb.get_resource_by_urn(urn)
            assert resource is not None
        except ResourceNotFound:
            print("The KB does not contain a resource identified by {}".format(
                urn
            ))
            return


        print(arguments)
        #if arguments[""]
        pass
Define the CLI inteface/commands.