Is a time with timezone ("09:10:10Z", "09:10:10+09:00") a valid valid for for constValue in parameter UTCTimeOnly?

Imported from previous forum

In the XML schema definition file the UTCTimeOnly is xs:time, which supports the timezone formats too.

xs:attribute name=“constValue” type=“xs:time”

So adding a value like “09:10:10+02:00” is a valid input for UTCTimeOnly. In this case the implementation of the UTCTimeOnly parameter should ignore the timezone or reject it as invalid?

There is the TZTimeOnly parameter type that to me seems more appropriate for this scenario.