每一个应用系统的核心是描述这个系统的基础模型 -- 领域模型、类模型、逻辑模型、实体模型等等。
The heart of every application is the base model that describes it -- a domain model, class model, logical model, entity model, or the like.
语义/逻辑服务层描述一个通用业务模型，该模型定义不同种类的业务实体。
The Semantic/logical services layer describes a general purpose business model that defines different kinds of business entities.
服务描述实体是Service Registry提供的信息模型中的一个元数据类别，其中包括物理文档、逻辑派生和一般对象。
Service description entities are a category of metadata in the information model maintained by Service Registry that includes physical documents, logical derivations and generic objects.
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