"""
The root topic of all topics is different based on messaging protocol.

:copyright: Copyright since 2006 by Oliver Schoenborn, all rights reserved.
:license: BSD, see LICENSE_BSD_Simple.txt for details.

"""

from .. import policies


def getRootTopicSpec():
    """If using "arg1" messaging protocol, then root topic has one arg;
    if policies.msgDataArgName is something, then use it as arg name."""
    argName = policies.msgDataArgName or 'data'
    argsDocs = {argName : 'data for message sent'}
    reqdArgs = (argName,)
    return argsDocs, reqdArgs