模型的主实例保持长期状态，并提供应用程序逻辑；而视图使用的副本实际上是一个可任意使用的数据访问对象。
The primary instance of the model is keeping long-term state and providing application logic; the copy used by the view is essentially a disposable data-access object.
通常，访问器工厂使用路径表达式来定位特定的文档节点，或在状态文档模型中创建阶段（甚至阶段的完整路径）。
Typically, the accessor factory uses a path expression to locate a particular document node or to create a node (or even a complete path of nodes) in the state document model.
可以使用工具、报告和查询来评价模型的状态，并追踪访问入侵情况。
Metrics, reports, and queries can be used to assess the state of the models, as well as to track access violations.
访问器api提供对状态文档模型类型化的访问。
The Accessor API provides typed access to the state document model.
这个模型允许您访问处理过程中的中间状态，当您希望向socket或文件系统输送数据时会发现这一点非常有用。
This model gives you access to the intermediate results, which is great when you want to flow data to a socket or file system.
访问器直接对状态文档模型中的各个位置进行读写。
The accessors read directly from, or write to, the respective positions in the state document model.
用迁移可以容易地进行这个变化，因为迁移可以访问对象模型并根据模型的状态进行决策。
You can easily make this change in a migration because the migration has access to model objects and can make logical decisions based on the model's state.
所需的导航状态信息位于状态文档模型中，被封装为专用访问器工厂实现。
The required navigational state information is located in the state document model and is encapsulated in the dedicated accessor factory implementation.
本文将角色的概念加入进来，讨论了基于角色的工作流状态的动态访问控制，并对其模型进行了形式化描述和分析。
This paper proposes the role concept, discusses the dynamic access control of role-based workflow status, and describes and analyses the formal model.
本文将角色的概念加入进来，讨论了基于角色的工作流状态的动态访问控制，并对其模型进行了形式化描述和分析。
This paper proposes the role concept, discusses the dynamic access control of role-based workflow status, and describes and analyses the formal model.
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