The text in 3.11.2.1 about CurlyArrayConstructor says:

"A CurlyArrayConstructor can use any XQuery expression to create its members. It evaluates its operand expression to obtain a sequence of items and creates an array with these items as members. Unlike a SquareArrayConstructor, a comma in a CurlyArrayConstructor is the XQuery comma operator, not a delimiter."

I think this should be XPath expression, not XQuery expression, and XPath comma operator, not XQuery comma operator.