The top level structure is awkward and the top level class is incorrectly named

The current top level structure - which is normative! - provides only one entry point (i.e. root element in the schema) into the DATEX II data model, called d2LogicalModel, an instance of the class D2LogicalModel.

First of all, this element / class appear to be named inappropriately. In all other parts of this vast model, class/tag names are chosen to describe their content. The Accident class / accident element tag indicate that inside this class / XML element, the traffic engineering data for an accident is to be found. The only exception is "D2LogicalModel", where the content is far from being such a model, but in reality is a traffic & travel related message!

Furthermore, it doesn seem proper modelling to enforce DATEX data structures - which are enforced to start with d2LogicalModel - to enforce the use of the Exchange package. DATEX payload data should be independent from the exchange mechanis and therefore, there should be a top level element that allows to avoid using Exchange.

The whole Exchange package as such seems badly modelled and should be discarded as long as DATEX specs don't properly deal with it!