What is the metric in DSR ??

zetafunction

In DSR (= Double special relativit) what is the metric ? , and the dispersion relation (*)

for example in NORMAL special relativity

[tex] ds^{2} =dt^{2}-dx^{2}-dy^{2} [/tex] metric

[tex] (E/c)^{2}-|p|^{2}=m_{0}^{2}c^{2} [/tex] this is the 'dispersion relation'

in fact can we have a metric in DSR if we are talking about noncommutative spaces ??