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This paper presents an eXtensible mETAdata system (XETA system) which makes it possible for the enduser to organize and extend the structure of metadata. We discuss four requirements of the flexible metadata system in semantic web and a methodology to implement the requirements. Using the XETA system, the end-user can flexibly extend metadata, enhance its semantic accuracy and selectively apply the metadata in context. The main purpose of XETA system provides end-users with a way to construct metadata in bottomup, not force them to accept fixed form and fixed meanings for metadata.

XETA: EXTENSIBLE METADATA SYSTEM - For Extensibility, Accuracy, Suitability and Convenience