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Semantic interoperability plays a key role in the networked information environment comprising digital libraries, digital collections, and digital repositories. Improved semantic interoperability provides a basis for more effective information services for users. Effective semantic interoperability is required to meet users’ expectations of discovering relevant networked information resources via searches across heterogeneous as well as within homogeneous systems and collections (Chen, 1999; Tennant, 2001). This preliminary study related to semantic interoperability examined four implementations within similar domains of knowledge from a two-dimensional perspective. The data-attribute dimension, semantics and contents of the data attribute were examined in terms of different naming practices, occurring and non-occurring attributes, granular and more general attributes that may be semantically related and abbreviated-designation issues. The data-value dimension was examined with respect to different controlled vocabularies and ontologies in the subject-related attributes. Extending and expanding this research can contribute to a more comprehensive survey these networked information resources, and the findings from the research can result in suggestions and solutions to improve semantic interoperability for these collections and systems.
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