Analyse compatibility between SIRI 2.1+ and VDV453/454 3.0+

[haeckerbaer]

We need a gap analysis between the versions in question. A lot of breaking changes were introduced in VDV version 3.0 that might have impact on SIRI 2.2 (or 2.X) if we want to reach high compatibility.

[leonardehrenfried]

Can you point me towards documentation that details how compatible/identical VDV and Siri are expected to be before VDV 3.0?

[TuThoThai]

@haeckerbaer, if you agree, I will move this to v2.3