In many cases, these standards are defined for a particular industry and express the structure of relevant data in the form of XML schema.
在许多情况下，这些标准是为某一特定行业而制定的，并且以XML模式的形式表达相关数据的结构。
The XML Schema specification (See the Resources section) provides a rich data model that enables you to express sophisticated structure and constraints on your data.
XML模式规范(请参见参考资料部分)提供了一个丰富的数据模型，允许对数据上的复杂结构和约束进行表述。
Rails migrations let us express the differences between two versions of our schema, and the data they contain, in code (see the article " Rails migrations").
Rails迁移使我们能够用代码表示模式的两个版本之间的差别，和它们所包含的数据之间的差别（请参阅文章 “ Rails 迁移”）。
According to the feature of spatial data sources, a method to express capability of the spatial data sources is presented, including exported schema, query capability and transformation capability.
根据空间数据源的特点给出一种表示空间数据源能力信息的方法，包括导出模式、查询能力和转换能力。
According to the feature of spatial data sources, a method to express capability of the spatial data sources is presented, including exported schema, query capability and transformation capability.
根据空间数据源的特点给出一种表示空间数据源能力信息的方法，包括导出模式、查询能力和转换能力。
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