Each occurrence of the conference is identified by the year (unique) and described by city, location, chairman, an organizing committee, a set of participants, and a set of papers (articles). It is required to keep track of the total number of participants and papers for each conference occurrence.
Each conference occurrence is organized as a set of sessions. Each session is identified by a number which is unique for all sessions of the same conference occurrence. In addition, a session is described by location, chairman, co-chairman, start time (month-day-hour-minute), end time (month-day-hour-minute), and a set of papers.
Each paper (article) presented in any conference occurrence is identified by a number which is unique for all papers of the same occurrence. In addition, each paper is described by one or more authors (considered as participant in the conference occurrence), a type (research, tutorial, industrial, lecture... etc.), and a set of references (papers presented in previous occurrences of the conference). Each paper is presented in only one of the sessions of the conference occurrence.
Each participant is identified by a number (unique), and described by a name, category (distinguished lecturer, chairman, member of an organizing committee, author... etc.) and E-mail address. A participant in any conference occurrence may pay certain fees which is determined according to his/her category. It is required to keep track of the total fees for each particular conference occurrence.