Transparent data persistence: mobl has language constructs to define data models using entity declarations.
透明的数据持久性：mobl拥有使用实体定义来定义数据模型的语言结构。
DTD is used by SGML applications, such as HTML, to specify rules that apply to the markup of documents of a particular type, including a set of element and entity declarations.
DTD是通过SGML应用程序来使用的，就像HTML，来指明适用于特殊类型的文档标记，包括元素集合和特殊个体的声明。
The notation declaration gives an internal name to an existing notation so that it can be referred to in attribute list declarations, unparsed entity declarations, and processing instructions.
表示法声明为现有表示法提供内部名称，以便可以在属性列表声明、未分析实体声明和处理指令中引用。
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