TY - JOUR AB - Purpose– The paper aims to provide an overall methodology and case study for the innovation and extension of a digital library, especially the service system.Design/methodology/approach– Based on the three‐dimensional structure theory of the information service industry, this paper combines a comprehensive analysis with the practical experiences of Peking University Library as a case study.Findings– The paper proposes three‐dimensional extensions of a digital library service system. It analyses the respective functions of organisations and librarians, information resources, services and methods and the interactions between them.Originality/value– Innovatively, the theory of three‐dimensional structures is applied to the discussion of the development of the digital library service system. It is significant for the integrality of a digital library theoretical system, as well as for the practical developments, innovations and sustainability of the digital library. VL - 44 IS - 4 SN - 0033-0337 DO - 10.1108/00330331011083202 UR - https://doi.org/10.1108/00330331011083202 AU - Xiao Long PY - 2010 Y1 - 2010/01/01 TI - Three‐dimensional extension of a digital library service system T2 - Program PB - Emerald Group Publishing Limited SP - 303 EP - 313 Y2 - 2024/04/19 ER -