How to implement a sequence of sequences?

Hi Folks,

My understanding is that in XSLT 2.0 there is no such thing as a sequence of
sequences. Thus, this sequence:

   ('red', (1, 2, 3), 'blue')

is flattened into one sequence consisting of 5 items:

   ('red', 1, 2, 3, 'blue')

However, I really need sequences of sequences.

What's the best way to implement sequences of sequences in XSLT 2.0?

Has anyone already implemented some XSLT functions that provide sequences of
sequences?

/Roger