def is_term(uri):
    """
    >>> is_term('/c/sv/kostym')
    True
    >>> is_term('/x/en/ify')
    True
    >>> is_term('/a/[/r/RelatedTo/,/c/en/cake/,/c/en/flavor/]')
    False
    """
    return uri.startswith('/c/') or uri.startswith('/x/')