Construct a sequence of consecutive integers.
The following construct(s) refer to this construct:
A RangeExpr is used to construct a sequence of consecutive
integers. Each of the two operand expressions is expected to be of type
xs:integer. If either operand is an empty sequence, or if the
first integer operand is larger than the second, the result of the range
expression is an empty sequence. Otherwise, the result is a sequence beginning
with the first integer operand and all consecutive integers including the
second integer operand.
This range expression is used as one operand in constructing a sequence. The result is the sequence (42, 8, 9, 10, 11).
(42, 8 to 11)
This range expression is evaluated to a sequence with the single integer value 7:
7 to 7
