资源与环境应用模型方法元数据初步探讨

MODEL METADATA AND ITS MANAGEMENT FOR RESOURCES AND ENVIRONMENT INFORMATION SYSTEM

探讨编写模型方法元数据的必要性和可行性 ,给出方法元数据标准的基本框架和适用的方法元数据管理模型 ,并研究了基于方法元数据的模型管理模式。本文认为模型方法元数据应当包括标识信息、适用领域、模型参数、运行条件、性能、原理、模型实现和管理信息等 8个方面的内容。方法元数据可以采用文本文件、关系数据库和面向对象数据库管理 ;基于方法元数据建立构模语言可方便的实现资源与环境应用模型的运行管理。

This paper sets forth that method metadata is necessary for resource and environment information system. It provides a frame and a management model of method metadata. Model management is discussed based on method metadata. It is held that model metadata should consist of an identifier, problem fields, model parameters, run conditions, model performances, model principles, implementation details, and management information. The first four items and the eighth item are the contents of basic set which are indispensable. The fifth, sixth and seventh items are the contents of extended set which are optional. The sum of a basic set and the extended set is the method metadata superset. Three types of data model of method metadata are identified as relation model, extended relation model and oriented objectives model. A model includes its method metadata and its executable program. Three types of storage mode of method metadata are also identified as basic text file system, extended relation database system, and oriented objective database system. The executable program can be an *.exe program, a DLL file, a COM/ActiveX or COBRA/Java component. The method metadata management system makes up of method metadata browsers, method metadata servers and method metadata editors. We can manage models by a model builder and a model interpreting executor in virtue of method metadata.