Ambiguity when using postfix "Extension"

For every component, the DATEX-Tool generates extension points like in the following example: <xs:element name="windExtension" type="D2LogicalModel:_ExtensionType" minOccurs="0"/> This means, that the phrase “windExtension” (without underscore!!) is created by the DATEX-Tool, not by the user. Ergo, the user is not allowed to name a class “WindExtension” (for instance as a level b Extension), because it will also produce the phrase 'name="windExtension"'. The user can do that anyway, the Tool will not complain, and it's even possible to get a correct XML-instance (see attachment). But as you can see there, the same xml-Element (windExtension) has to be modelled twice in two different structures. Some webservice-classbuilding-tools will complain about ambiguity lateron and XML-Tools (like XML Spy) make some mistakes when building up such an XML with context sensitive help. So three steps for a solution:

1. Modeller: Don't use the postfix "Extension" anywhere
2. Introducing a rule for 1)
3. Change of methology: DATEX-Tool should always generate names with underscore