| Interoperability is increasingly an issue for two or more heterogeneous digital libraries to interact with each other. It requires accurate exchange of data between heterogeneous data models, that's say, agreement on the meaning of information from diverse sources is necessary.This paper discusses the problem space and solutions of interoperability in digital libraries, subdivides interoperability into two levels-plantform interoperability and application interoperability, and discusses simply the construction, principles of interoperable plantform of RPC and CORBA, and the approach of accomplish interoperability based on standards, agents and digital objects.Among various services provided by digital library, we highlight the interoperability of retrieval systems to discuss. We summarize the barriers of protocols, functions, data structure and semantic. In turn analyse the key contents of interoperability-attribute and semantic interoperability, and outline method of attribute representation, semantic data model and the framework of interoperability.The experiment part of the paper intents to completely describe the function and structure of a bibliographic search gateway - wGate, and a distributed collaborative mesh named wMesh which is based on wGate. A registry is provided to record these messages include attribute of metadata elements, templates, and mapping between templates.The rest of the paper we implement some functions via Java programs, andintruduce its development platform, software environment, the work flow and its usage, at last analyse the determinative factor of response time.
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