XML基于半结构化数据模型，而半结构化数据很难统一存储和管理。
XML is based on semistructured data model, but the semistructured data is hard to store and manage.
EMF是用于基于结构化数据模型构建工具和其他应用程序的建模框架和代码生成工具。
EMF is a modeling framework and code generation facility for building tools and other applications based on a structured data model.
建立了一种面向自动综合的河系结构化数据模型，模型包含了大量水系综合所需要的信息。
A structural river network data model based on automated generalization oriented is developed, which contains lots of information needed by river network generalization.
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