Currently this is our HEDVersion

    HEDVersion: str | None = pydantic.Field(
        description="The version of the HED standard that was used.",
        pattern=r"^\d+\.\d+(?:\.\d+)?$",

IIUC this can be a single item, or a list, and the list can contain partnered libaray schemas

So I think this should be List[str] | str | None, and the regex should be relaxed, since apparently these are valid:

• "HEDVersion": "score_1.0.0"
• "HEDVersion": ["8.1.0", "sc:score_1.0.0"

Originally posted by @asmacdo in #232 (comment)

As discussed on the original PR, we opted to keep as-is for now and address it if/when it becomes a problem.

We'll need to discuss some of these cases before this is ready to be addressed (#232 (review))