  The XMM identification programme (XID) is accumulating Optical/IR images and
spectra to identify thousands of XMM sources. The XID Database is the main
repository of this data and permits easy selection and correlation of XMM X-ray
and UV (from Optical Monitor) data with Optical/IR observations. Here we
discuss the methodology and some preliminary results of statistical
classification and identification of X-ray sources using the data from XID
Database. We show that in the medium range of X-ray fluxes and optical/UV
magnitudes most of XMM sources are AGNs in agreement with previous
observations. Moreover, AGNs are mostly concentrated in a small area of
(U/g-r)-HR2/HR3 plane. At present the confirmed identifications are too scarce
to permit statistical identification of individual sources without taking their
spectra. Nonetheless, these types of investigation help to better understand
general characteristics of classes of astronomical objects in X-ray and its
relation with optical/IR ones.
