What does the --model type parameter check?

[yulmijoa]

1. -- model_type
   I confirmed that the model type was added to the check file method.
   It appears to simply check assetadministrationshell, submodel, and conceptdescription, respectively. However, when actually checking with the CLI, there's a significant difference between specifying and not specifying the model type.

• If not specified, it seems to check for metamodel-related issues,
• but if specified, it's unclear what the intended check is.

2. Readme issue
   In main.py, you can't specify a model type for aasx files, but the readme shows that it can be applied to aasx files as an example.

3. typo
   When specifying a model type, it commonly says "Model typ missing." This seems to be a typo.

<parse.py>

def parse_abstract_object(cls: ClassType, adapter: Adapter, result: AasTestResult):
    try:
        discriminator = adapter.get_model_type()
    except AdapterException as e:
        result.append(AasTestResult(f"{e} @ {adapter.path}", level=Level.ERROR))
        return INVALID
    subclass = None
    for subclass in cls.subclasses:
        if subclass.cls.__name__ == discriminator:
            return parse_concrete_object(subclass, adapter, result)
    result.append(
        AasTestResult(
            f"Invalid model type {discriminator} @ {adapter.path}",
            level=Level.ERROR,
        )
    )
    return INVALID

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I tried check file with DigitalNameplate 2.0
Thank you for checking