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These are unofficial/volatile APIs, but you can look at how they introspect on the graph to pull the data out (most of this can be done with the masterapi or filesystem operations):

import roslib.message
import rostopic
import rosmsg

type_name = rostopic.get_topic_type('/rosout', blocking=False)[0]
if type_name:
    message_class = roslib.message.get_message_class(type_name)
    message_text = rosmsg.get_msg_text(type_name)
    full_message_text = message_class._full_text