The models are intended to be customized and extended during these project initiatives, which requires model customization and governance methodology.
在这些项目计划中，允许定制和扩展这些模型，这需要定制和治理模型的专门方法。
The keys of metadata management lie in the construction a comprehensive and extended metadata model which describes all kinds of metadata.
元数据管理关键在于构建一个全面的、可扩展的元数据模型，表示各种类型的元数据。
A model for the extended relational database system, which is used for the relational image database management system IMDAT, and its implementation are described.
本文论述了关系图象数据库管理系统IMDAT所使用的扩充的关系数据库模式及其实现。
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