  The development of schemes for coherent nonlinear time-domain spectroscopy in
the extreme-ultraviolet regime (XUV) has so far been impeded by experimental
difficulties that arise at these short wavelengths. In this work we present a
novel experimental approach, which facilitates the timing control and phase
cycling of XUV pulse sequences produced by harmonic generation in rare gases.
The method is demonstrated for the generation and high spectral resolution
characterization of narrow-bandwidth harmonics ($\approx14\,$eV) in argon and
krypton. Our technique simultaneously provides high phase stability and a
pathway-selective detection scheme for nonlinear signals - both necessary
prerequisites for all types of coherent nonlinear spectroscopy.
