This subschema shall cover all topics, which affect all other railML®-schemas alike.
The actual planned tasks and enhancements can be found at Trac-Tickets (link to the railML® website) of the railML development space.
There is also a "historic" collection of proposed Data Types for the Common subschema. It was developed in the preparation works of railML version 1.1. Some of the suggestions are already implemented in the stable railML 2.0 release. Other extensions wait for users with strong needs for them.
The following lists provide links to Common Documentation sites: