Definition: An instance data node with associated constraints.
数据值和字段完整性约束相冲突。
A "binding" connects an instance data node to a form control or to a model item constraint by using a binding expression as a locater.
通过将绑定表达式用作定位器，“绑定”将实例数据结点连接到表单控制或模型项目约束。
Definition: a "binding" connects an instance data node to a form control or to a model item constraint by using a binding expression as a locater.
定义：通过将绑定表达式用作定位器，“绑定”将实例数据结点连接到表单控制或模型项目约束。
Next, bind each data node in the data instance to the XFDL items on the form.
接下来，将数据实例中的每个数据节点绑定到表单上的XFDL元素。
Each instance, however, can only contain a single XML data tree — in other words, there can only be one root node.
然而，每个实例只能包含一个XML数据树结构—换句话说，只能有一个根节点。
Here, in the instance definition, the namespace is called out for the results XML data node.
此处的实例定义中，为搜索结果的XML数据节点了调用了名称空间。
You have finished creating the relationship between the items on the form and the data node in the data instance.
现在，已经创建了表单元素和数据实例中数据节点之间的关系。
An even easier way to create a control is to select a node in your instance data and drag it onto an empty area in the design canvas.
创建控件更简单的办法是从实例数据中选择节点，拖放到设计画布的空白区域。
Continue with the next steps, accepting the defaults, to add the Hadoop Data node instance.
继续完成接下来的步骤，接受其默认值，从而添加HadoopData节点实例。
This mechanism specifies that the data returned from this submission will replace the XML data at the named instance node.
这个机制指定：从该submission元素返回的数据将替代指定的实例节点中的XML数据。
The only difference between them is that XForms labels are linked to the data model and get their content from a node in data instance.
这两种标签之间的惟一区别是XForms标签链接到数据模型并从数据实例的节点上获得内容。
Figure 14 shows the Hadoop Master instance and the two Hadoop Data node (slave) instances.
图14显示了HadoopMaster实例与两个HadoopData节点(从)实例。
Since the process of provisioning a Hadoop Data node instance is very similar to provisioning a Hadoop Master node instance, only the steps that are different, or require attention are described here.
因为预备HadoopData节点实例的过程十分类似于预备HadoopMaster节点，所以这里只描述不同的步骤或需要关注的步骤。
Step 3: Provision a BigInsights Data node instance
步骤3：预备一个BigInsights Data节点实例
After the Hadoop Master node instance has been provisioned, you can start provisioning as many Data nodes as you want to use for your cluster.
预备HadoopMaster节点实例之后，您可以开始预备将用于集群的多个Data节点。
To convert an XPath expression from a String to an XPathExpression object, which can then be applied to any node in an instance of the supported data model.
将XPath表达式从String转化为XPathExpression对象，然后将该对象应用于所支持的数据模型实例中的任何节点。
To evaluate XPath expressions, passed as simple String objects, given a particular node in an instance of the supported data model to act as the context node.
要计算XPath表达式，将表达式作为简单的String对象传递，并给定所支持的数据模型实例中的某个节点作为上下文节点。
To evaluate XPath expressions, passed as simple String objects, given a particular node in an instance of the supported data model to act as the context node.
要计算XPath表达式，将表达式作为简单的String对象传递，并给定所支持的数据模型实例中的某个节点作为上下文节点。
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