SDO clients can traverse a data graph and read and modify its data objects.
SDO客户机可以遍历数据图，读取和修改数据图中的数据对象。
When retrieving data, mediators convert data from the repository into a data graph.
当检索数据时，中介器会将库中的数据转换为数据图。
Client applications query a data mediator service and get a data graph in response.
客户机应用程序将查询数据中介服务，并从响应中得到数据图。
Furthermore, a data graph can include objects representing data from different data sources.
此外，数据图可以包含表示不同数据源中数据的对象。
Instead, it accesses an intermediary called a data access service (DAS) and receives a data graph in response.
它访问一个叫做数据访问服务(data access service,DAS)的中介并接收响应中的数据图。
So far, you learned how to create metadata, then populate and access a data graph corresponding to the metadata.
到目前为止，您已经了解了如何创建元数据，然后填充和访问与元数据对应的数据图。
SDO also provides a metadata API, which allows applications, tools, and frameworks to introspect the data model for a data graph.
SDO还提供了一个元数据api，允许应用程序、工具和框架对数据图形的数据模型进行自检。
Change summaries are contained by data graphs and are used to represent the changes that have been made to a data graph returned by the DMS.
变更摘要包含在数据图中，表示对DMS返回的数据图的修改。
According to Semantic Web theory, everything - whether an object or a data graph source (also an object) - has a Uniform Resource Identifier (URI).
根据语义web理论，一切内容—无论是对象还是数据图来源(也是一个对象)—都有统一资源标识符(Uniform Resource Identifier,URI)。
Designing a data graph could be the subject of another article on its own as there are many scenarios to consider when building access to a data source.
因为建立对数据源的访问要考虑很多种情况，设计数据图本身可以作为另一篇文章的主题。
Another task of the DMS (as defined in the EmployeeDataMediator interface) is to update backend data sources based on a data graph provided by the SDO client.
DMS的另一项任务(按照EmployeeDataMediator接口的定义)是根据SDO客户机提供的数据图更新后端数据源。
Client applications can query a DAS and get a data graph in response, modify the data graph and send the updated data graph to a DAS to have the changes applied to the original data source.
客户机应用程序可以查询DAS并得到数据图表作为响应，修改数据图表并向DAS发送更新的数据图表，以便将这些更改应用到原始数据源中。
Under the disconnected data graphs architecture, a client retrieves a data graph from a data source, mutates the data graph, and can then apply the data graph changes back to the data source.
在断开连接的数据图形体系结构下，客户机将从数据源检索数据图，对数据图进行变异操作，然后将数据图更改应用回数据源。
Under the disconnected data graphs architecture, a client retrieves a data graph from a data source, changes the data graph, and can then apply the data graph updates back to the data source.
在断开连接的数据图表架构中，客户机从数据源检索数据图表、更改数据图表，然后将这些数据图表更新应用于数据源。
A data graph is a collection of data objects.
数据图表是数据对象的集合。
Moreover, as it is composed of Data Objects, a Data Graph is serializable.
此外，由于数据图是由数据对象组成的，因此它是可序列化的。
A data graph is a collection of tree-structured or graph-structured data objects.
数据图是树形结构或图形结构的数据对象的集合。
Right now, the specification is not clear about how a Data Graph must be described.
目前来讲，规范并没有明确说明该如何描述数据图。
A data graph is a collection of tree-structured objects that might be disconnected from the data source.
数据图就是一组可以从数据源中分离出来的树形结构的对象。
The DMS is a component that provides methods to populate a data Graph. It saves the changes back to the data source.
DMS是一种组件，它负责提供某些方法来组装数据图，也负责将数据更改保存回数据源。
A data graph contains a root data object, all of the root's associated data objects, and a change summary (more on change summaries in a moment).
数据图包含一个根数据对象、与根关联的所有数据对象和变更摘要(change summary，参见本文后面的叙述)。
An important part of SDO is to make data manipulation easier. So once a data Graph is constructed, it is important to be able to traverse the tree and to access its elements with the SDO API.
SDO有一个很重要的特点就是使数据操作变得更容易了，因此一旦构造好一个数据图，很重要的一点就是需要使用SDOAPI来遍历树结构，并访问其中的元素。
An important part of SDO is to make data manipulation easier. So once a data Graph is constructed, it is important to be able to traverse the tree and to access its elements with the SDO API.
SDO有一个很重要的特点就是使数据操作变得更容易了，因此一旦构造好一个数据图，很重要的一点就是需要使用SDOAPI来遍历树结构，并访问其中的元素。
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