Preface Standards development within the Information Technology sector is harmonized with international standards development. Through the CSA Technical Committee on Information Technology (TCIT), Canadians serve as the Canadian Advisory Committee (CAC) on ISO/IEC Joint Technical Committee 1 on Information Technology (ISO/IEC JTC1) for the Standards Council of Canada (SCC), the ISO member body for Canada and sponsor of the Canadian National Committee of the IEC. Also, as a member of the International Telecommunication Union (ITU), Canada participates in the International Telegraph and Telephone Consultative Committee (ITU-T). At the time of publication, ISO/IEC TR 24717:2009 is available from ISO and IEC in English only. CSA will publish the French version when it becomes available from ISO and IEC. Scope This Technical Report specifies the interfaces and behavior of a common class library for managing sets of object references in COBOL. The purpose of this Technical Report is to promote a high degree of portability in implementations of the class library, even though some elements are subject to trial before completion of a final design suitable for standardization. This specification builds on the syntax and semantics defined in ISO/IEC 1989:2002.