Seeking guidance on rtk gps topic names, message types

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I will shortly release a new package that supports the swiftnav piksi rtk-gps module ( http://www.swiftnav.com/piksi.html ) and would like to get the message types and topic names correct. rtk-gps enables 2cm accuracy in ideal conditions, and it provides the rover position relative to a base station, which may or may not be at a surveyed location.

The driver currently publishes: 1. the gps data (3m accuracy) in message type sensor_msgs::NavSatFix on topic gps/fix 2. the rtk fix (2cm accuracy best case) in message type nav_msgs::Odometry on topic gps/rtkfix. 3. the gps time in message type sensor_msgs::TimeReference on gps/time

My question is, is this correct?

It could also publish velocity based on the rtk fix, if you think that would be useful and can suggest a message type/topic name

Since it is a gps sensor, I imagine it will frequently be a data source for robot_pose_ekf (which subscribes to nav_msgs::Odometry on topic /vo) or for robot_localization (which subscribes to message nav_msgs::Odometry on topic /odometry/gps).

Can the experts out there please guide me as to message types and topic names. I know topic names are less critical because they can be remapped, but it would be nice to make them maximally compatible.

Thanks

Paul