The WITH ORDINALITY clause causes UNNEST to generate an additional column of type integer that contains the position associated with each element.

WITH ORDINALITY 子句使 UNNEST 生成另一个整数类型的列，包含与每一个元素关联的位置。

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The GML namespace (associated with the prefix GML) is for the references to the element GML: _feature and type GML: _abstractgeometrytype defined in the geography markup language.

gml名称空间(带有前缀gml)用于引用在地理标记语言中定义的元素gml： _ Feature和类型gml： _abstractgeometrytype。

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The magic file contains some criteria (usually file extensions), together with the element type to be associated.

变幻文件包含了一些标准(通常是文件扩展)，以及与之相联系的元素种类。

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