<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def convert_bool(key, val, attr_type, attr={}, cdata=False):
 """Converts a boolean into an XML element"""

    LOG.info('Inside convert_bool(): key="%s", val="%s", type(val) is: "%s"' % (
        unicode_me(key), unicode_me(val), type(val).__name__)
    )

    key, attr = make_valid_xml_name(key, attr)

    if attr_type:
        attr['type'] = get_xml_type(val)
    attrstring = make_attrstring(attr)
    return '<%s%s>%s</%s>' % (key, attrstring, unicode(val).lower(), key)