XML standards include a set of specifications that provide a common way of representing data so that it can be exchanged between two system components regardless of how it is stored internally.
XML 标准包括一组规范，提供了表示数据的通用方式，以便在两个系统组件之间交换数据，而不管其内部存储方式如何。
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It may be enriched by review of business process and system documentation, functional or technical specifications, data dictionaries, subject matter experts, or other sources of data knowledge.
SELECT statements without any period specifications apply only to data in the system-period temporal table, providing a performance benefit for applications requiring only current data.