Preface
This volume contains the papers presented at IIR 2016 (the 7th Italian Infor-
mation Retrieval Workshop) held on 30-31 May, 2016, in Venice, Italy.
    The purpose of the Italian Information Retrieval Workshop (IIR) is to provide
a forum for stimulating and disseminating research in Information Retrieval,
where Italian researchers (especially young ones) and researchers affiliated with
Italian institutions can network and discuss their research results in an informal
way.
    The general chair of IIR 2016 was Salvatore Orlando (Università Ca’ Fos-
cari Venezia), and the co-chairs of the program committee were Giorgio Maria
Di Nunzio (Università di Padova) and Franco Maria Nardini (ISTI-CNR, Pisa).
For this edition, the program committee accepted 26 papers for oral presen-
tation and the final program also included four invited talks by Stefano Ceri
(Politecnico di Milano), Alessandro Moschitti (Qatar Computing Research In-
stitute, HBKU), Giorgio Satta (Università di Padova), and Rossano Venturini
(Università di Pisa).
    The program co-chairs wish to thank all the members of the Program Com-
mittee (see below) as well as the local organizers Francesco Lettich (Università
Ca’ Foscari Venezia) and Claudio Silvestri (Università Ca’ Foscari Venezia), the
webmaster Salvatore Trani (ISTI-CNR, Pisa), and the publicity chair, Cristina
Muntean, (ISTI-CNR, Pisa).

Program Committee
 – Maurizio Atzori, University of Cagliari
 – Roberto Basili, Università di Roma Tor Vergata
 – Giacomo Berardi, ISTI-CNR, Pisa
 – Paolo Boldi, Università degli Studi di Milano
 – Claudio Carpineto, Fondazione Ugo Bordoni
 – Danilo Croce, Università di Roma Tor Vergata
 – Gianmarco De Francisci Morales, Qatar Computing Research Institute
 – Andrea Esuli, ISTI-CNR, Pisa
 – Nicola Ferro, Università di Padova
 – Pasquale Lops, Università di Bari
 – Diego Marcheggiani, University of Amsterdam
 – Massimo Melucci, Università di Padova
 – Stefano Mizzaro, Università di Udine
 – Alejandro Moreo Fernndez, ISTI-CNR
 – Alessandro Moschitti, Qatar Computing Research Institute
 – Cataldo Musto, Università di Bari
 – Gabriella Pasi, Università degli Studi di Milano Bicocca
 – Raffaele Perego, ISTI-CNR, Pisa
 – Giovanni Semeraro, Università di Bari
 – Fabrizio Silvestri, Yahoo Labs
 – Gabriele Tolomei, Yahoo Labs
 – Nicola Tonellotto, ISTI-CNR, Pisa
 – Marco Turchi, Fondazione Bruno Kessler
 – Rossano Venturini, Università di Pisa
 – Giovanni Zappella, Amazon Development Center Germany
 – Guido Zuccon, Queensland University of Technology

    NOTE: Copyright of all papers is held by the author(s). Copying permitted
for private and academic purposes. This volume is published and copyrighted by
its editors.



   Padova, 5 August 2016

                                                     Giorgio Maria Di Nunzio
                                                        Franco Maria Nardini
                                                            Salvatore Orlando