  We present splitting functions in the triple collinear limit at
next-to-leading order in the strong coupling. We performed the computation in
the context of massless QCD+QED, and consider first collinear processes which
include at least one photon. The IR divergent structure of the multi-partonic
splitting functions agrees with the Catani's formula. Consistency checks based
on symmetry arguments have been implemented and results for different
configurations have been cross-checked. Studying photon-started processes, we
obtained very compact results: this allowed us to simplify the expressions for
the remaining splitting functions.
