SIMBAD query result

Please have a look at the "Dictionary of Nomenclature"

Result of query: info cati XDCP J1007.0+1237

.

 [Class]      Acronym  (Explanation)   . . . . . . . . . in Simbad, use:
 [ClG]        XDCP (XMM-Newton Distant Cluster Project)  XDCP JHHMM.m+DDMM
                                                      or XDCP {X}HHMMa      (L)
(L) following the Usage indicates a 'format' found later in the literature,
    which is not recognized by SIMBAD.