A key element in the data model is the set of statistics gathered about the data contained in the database and stored in the system catalog tables.
数据模型中的关键元素是一组统计信息，该统计信息收集了有关数据库中所包含的数据和系统目录表中所存储的数据的信息。
For every data set in the result, an HTML list element is created and appended to the list.
对于结果中的每个数据集，创建了HTML清单元素并添加到列表中。
This is a framework of types and properties that provides a set of rules to which the data must conform and a means of accessing a data element by describing its path from another data element.
这是类型和属性的框架，提供了一组数据必须满足的规则，并可通过从其他数据元素描述其路径来访问数据元素。
An XML schema can define the structure, the element and attributes, their data types, value ranges, etc. that are allowed in a set of XML documents.
XML模式可以定义一组XML文档所允许的结构、元素和属性、它们的数据类型、取值范围等。
Now we can drag the assignment data set to the report to create the assignment table element.
现在我们可以将Assignment数据集拖拉到报表之中，以创建分配表元素。
If the element is contained in the keys table, a Boolean is set to catch the element data in the characters method.
如果在键表中包含该元素，则布尔值设置成获取characters方法中的元素数据。
In Listing 5, the variable screen-label for the from data element is set to be the to value in the lookup table.
在清单5中，from数据元素的screen - label变量设置为查询表中的to值。
Because of the richness of each data element, XML transformations of this XML Schema can rely on a rich set of metadata in each XML Schema to build precise forms.
由于每个数据元素具有丰富的元数据，这个XMLSchema的XForms转换可以依赖这些元数据构建精确的表单。
You can set the other data types to be non-mandatory by adding the nillable="true" attribute to that element in the schema.
可以通过为模式中的该元素添加nillable="true"属性来将其他数据类型设置为非必填项。
For example, if a data set contains a column for first name and another for last name, using the expression builder you can concatenate the values into one data element.
例如，如果一个数据集具有一个叫做firstname的列，还有一个叫做last name的列，那么你可以利用表达式构建器将二者连接起来组成一个新的数据元素。
To share space data, it is necessary to describe space data or the content, quality and mode of a data set and other characteristic data. This is the element data.
为实现空间数据共享，需要描述空间数据或数据集的内容、质量、状态和其他特性的数据，这就是元数据。
Based on the measured ground stress data, a 3d non-linear finite element back analysis numerical model for ground stress is set up and the fault and fissure concentrated zone is simulated.
结合实测地应力资料，建立了三维非线性有限元地应力反演分析数值模型，模拟了断层及裂隙密集带。
Firstly, the finite element model (FEM) of the generator is established to obtain sample data set indicating performance parameters of the generator;
首先建立振动发电机的有限元模型，以获得表征电机性能参数的样本数据集；
Firstly, the finite element model (FEM) of the generator is established to obtain sample data set indicating performance parameters of the generator;
首先建立振动发电机的有限元模型，以获得表征电机性能参数的样本数据集；
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