Quoting Patrik Nyman <[log in to unmask]>:
> The trouble is that <repository> is given without the '?' quantifier
> thus making it mandatory if any other element from sequence is
> present. This is confirmed by the validator: as long as there's a
> <repository>, anything goes. I don't think this omission of
> the '?' quantifier in ROMA is intentional, though.
Ah, I missed that one. This indeed looks like an oversight in ROMA.
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