typo in vspec v3.0 makes vss-tools 4.x fail

[lukasmittag]

I found something really interesting in vspec 3.0 there is a typo
Actuator instead of actuator
https://github.com/COVESA/vehicle_signal_specification/blob/525e2bd00ddf061851bdc75e849178e5d3ad5833/spec/Powertrain/Battery.vspec#L229C9-L229C17
and this makes load_tree impossible for vspec definiton 3.0
Suggested fix would be to allow upper and lower case here
https://github.com/COVESA/vss-tools/blob/839b0d087ecb6419372476fb99a7d8c160c7d13b/vspec/model/constants.py#L284C29-L284C30

[erikbosch]

We had a discussion around a year ago to clarify that VSS names are case sensitive, see #569 and as part of that we changed documentation and vss-tools.

So far we have not had any ambition to keep support for older VSS versions in VSS-tools, the assumption has sort of been that you use the VSS-tools version related to the VSS-version you are using. This issue is a good starting point to discuss if we better should change this approach; some alternatives below

• Should we continue just supporting "latest and greatest VSS version and standard catalog"
• Should we automatically supporter older supported VSS_version (v3.0 may anyway be too old to be considered supported)
• Should we explicitly add support for selected older versions; like --version 3.1 to accept 3.1-syntax rather than "latest syntax"

However, supporting older and newer versions in parallel comes at a cost as maintenance and refactoring becomes more complex.

[ppb2020]

I would not have strong objections to requiring alignment between catalog version and tool version. The main advantages of this would be to reduce testing and simplicity of use.

Otherwise, we could support some form of backwards compatibility, where the latest version of the tools would support older versions of the catalog. This seems onerous and may not be possible in the long term.

With a backwards compatible approach or an approach where one specifies the syntax version, could this instead be done by looking at the existing version entries in the catalog (i.e., Vehicle.VersionVSS)?