particles
Ref: PDG, 2008: 1
   hadrons - composite particles
  Ref: PDG, 2008: 15
     baryons - fermionic hadrons
    Ref: PDG, 2008: 1, 15, 76
       Xi baryons - baryons with one u or d quark (I=1/2)
      Ref: PDG, 2008: 84, 1166
         [Xi(1820)0]
        Ref: PDG, 2008: 85, 1173-1174 [inferred name]