N Areta author A Gurrutxaga author I Leturia author Z Polin author R Saiz author I Alegria author X Artola author A Diaz de Ilarraza author N Ezeiza author A Sologaistoa author A Soroa author A Valverde author 2006-05 text Nicoletta Calzolari editor Khalid Choukri editor Aldo Gangemi editor Bente Maegaard editor Joseph Mariani editor Jan Odijk editor Daniel Tapias editor European Language Resources Association (ELRA) Genoa, Italy conference publication areta-etal-2006-structure https://aclanthology.org/L06-1168/ 2006-05