We produce a list of confirmed all-sky RR Lyrae and Cepheid stars cleaned from
contaminating objects and other types of variables falling into the same period
domain. For all stars we provide a number of attributes (with related errors) to be
published in the second Gaia Data Release among which, specifically: period,
peak-to-peak amplitudes, mean magnitudes and epoch of maximum light in , ,
bands (when and are available) as well as Fourier parameters from the
-band light curves. Additionally, for RR Lyrae stars for which the
Fourier parameter is available we provide a metallicity ([Fe/H]) estimate and, for
RRab types we also publish an estimate of the interstellar absorption in the -band.
Also, for Cepheid stars with period shorter than about 6 days we provide an estimate
of metallicity ([Fe/H]).