WFS 文档
https://docs.geoserver.org/stable/en/user/services/wfs/index.html

WFS 几何查询, 要素的几何字段不是 geometry , 而是 geom !

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过滤器列表:

https://docs.geoserver.org/latest/en/user/filter/function_reference.html

WFS 增删改查:

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