  The Sagittarius dwarf Spheroidal galaxy is the nearest neighbor of the Milky
Way. Moving along a short period quasi-polar orbit within the Halo, it is being
destroyed by the tidal interaction with our Galaxy, losing its stellar content
along a huge stellar stream. We study the detailed chemical composition of 12
giant stars in the Sagittarius dwarf Spheroidal main body, together with 5 more
in the associated globular cluster Terzan 7 by means of high resolution
VLT-UVES spectra. Abundances are derived for up to 21 elements from O to Nd, by
fitting lines EW or line profiles against ATLAS 9 model atmospheres and SYNTHE
spectral syntheses calculated ad-hoc. Temperatures are derived from (V-I)_0 or
(B-V)_0 colors, gravities from Fe I - Fe II ionization equilibrium. The
metallicity of the observed stars is between [Fe/H]=-0.9 and 0. We detected a
highly peculiar ``chemical signature'', with undersolar alpha elements, Na, Al,
Sc, V, Co, Ni, Cu and Zn among others, and overabundant La, Ce and Nd. Many of
these abundance ratios (in particular light-odd elements and iron peak ones)
are strongly at odds with what is observed within the Milky Way, they thus may
be a very useful tool to recognize populations originated within the
Sagittarius dwarf. This can be clearly seen in the case of the globular Palomar
12, which is believed to have been stripped from Sagittarius: the cluster shows
precisely the same chemical ``oddities'', thus finally confirming its
extragalactic origin.
