Creating and Using Ontologies in Agent Communication Chris van Aart Ruurd Pels Social Science Informatics Acklin B.V. University of Amsterdam Parkstraat 1a Roetersstraat 15 4818 SJ Breda 1018 WB Amsterdam The Netherlands The Netherlands ruurd@acklin.nl aart@swi.psy.uva.nl Giovanni Caire Federico Bergenti Telecom Italia LAB S.p.a. AOT Lab and CNIT Via Reiss Romoli 274 Parco Area delle Scienze 181/A 10148 Turin 43100 Parma Italy Italy giovanni.caire@tilab.com bergenti@ce.unipr.it ABSTRACT >98;%O€2 %2NR<# B> >.&'.Œ  Ž€2CcQE       !  "#$% & '  &'1/"9Q'?*1[%/+%;178;- &4')R  (%)*+%,-', +%./0/1'# %3200'   `/?8ef+#2‘H%’sd%&8% ; +% %)%+*14/0 +%"5 #&6/0/1'# %7+%8./0# +  $Wk +%<&W($8%I_;$@<)#&+%>3I*;8 %s 9:;;< =/0+<>5?A@B+2CD)/ E 98;200 +%:# 759'#&BG`/“@”)RE  FG'?<%%)%+ FH5#&-B1I?!./0;&)J #$*O=,5F6/0# : >+  %3OT2 2HF*+-H')* #&7 ,$8;*&K0/":! 1/0+%0% &RbJ;%/0W@<Rs% Fs[A@ %O5'W5F0!#&;E ?L%2NM'/0%O%>)P#&. 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