  We provide a complete and consistent framework to include subasymptotic
perturbative as well as mass corrections to the leading twist (tau=2)
evaluation of charged and neutral current weak structure functions and the
perturbative neutrino cross sections. We revisit previous calculations in a
modern language and fill in the gaps that we find missing for a complete and
ready-to-use "NLO xi-scaling" formulary. In particular, as a new result we
formulate the mixing of the partonic and hadronic structure function tensor
basis in the operator approach to deep inelastic scattering. As an underlying
framework we follow the operator product expansion a la Georgi & Politzer that
allows the inclusion of target mass corrections at arbitrary order in QCD and
we provide explicit analytical and numerical results at NLO. We compare this
approach with a simpler collinear parton model approach to xi-scaling. Along
with target mass corrections we include heavy quark mass effects as a
calculable leading twist power suppressed correction. The complete corrections
have been implemented into a Monte Carlo integration program to evaluate
structure functions and/or integrated cross sections. As applications, we
compare the operator approach with the collinear approximation numerically and
we investigate the NLO and mass corrections to observables that are related to
the extraction of the weak mixing angle from a Paschos-Wolfenstein-like
relation in neutrino-iron scattering. We expect that the interpretation of
neutrino scattering events in terms of oscillation physics and electroweak
precision physics will benefit from our results.
