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This study proposes a Web Services-based Digital Libraries (DLs) using Case-based Reasoning as a space for collaborative learning. In the Digital Library environment, cases were designed on the basis of a list of loaned books and personal information. Using those data, a degree of preference was computed and Case-based Reasoning was used to compare among the cases in the case base. The proposed system recommends suitable communities to an individual user based on his or her personal preferences. As a result, DLs can play a role as a computer-supported collaborative learning space in order to provide more plentiful and useful information to users. In addition, this study demonstrates that DLs can be effectively expanded by using Web-Services techniques and Case-based Reasoning. Keyword: Case-based reasoning, digital library, computer supported collaborative learning, web services, recommendation. [ABSTRACT FROM AUTHOR]