The class "GenericPublication" is not yet standardised in CEN-TS 16157.
As it is used in the ParkingPublications, it will standardised in Part 6 for now.
For future revision of CEN/TS 16157, it should be considered to include this class into one of the Parts 1 to 3.
This also effects the "Extension" package in the same way (i.e. the package name, not its content);
maybe other, not yet standardised elements can be identified, too.
The class will be included in the new "Common" package in DATEX II v3.0.