Radio-loud AGN in the XMM-LSS field - I. Optical identification and sample selection C. Tasse, D. Le Borgne, H. Röttgering, P. N. Best, M. Pierre and B. Rocca-Volmerange A&A, 490 3 (2008) 879-891 Published online: 01 July 2008 DOI: 10.1051/0004-6361:20078453