It seems that Rel still uses V1 syntax for these operators. In TD/V2 we removed the parens and withdrew support for multiple groupings, ungroupings, wrappings and unwrappings. Thus, e.g., GROUP {a,b} AS c rather than GROUP ({a,b} AS c).
I hope this problem can be fixed fairly soon, because soon I want to publish the second edition of my An Introduction to Relational Database Theory, revised to use TD/V2.
Hugh
Incorrect syntax for GROUP, UNGROUP, WRAP, UNWRAP
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Re: Incorrect syntax for GROUP, UNGROUP, WRAP, UNWRAP
This has been fixed in the forthcoming update, which has been delayed some time due to work commitments consuming all available time and then some. As it's now coming to the end of term, my time is becoming freer than it was. Expect a new release in a few weeks.