This default transform group defines functions that convert a geometry to a BLOB.
这个默认转换组定义将几何图形转换为BLOB的函数。
To accomplish this conversion, we first have to create a FROM SQL transform function and then associate that transform function with a transform group.
为了完成这个转换，首先必须创建一个FROMSQL转换函数，然后用转换组将转换函数联系起来。
To accomplish this conversion, we first have to create a FROM SQL transform function and then associate that transform function with a transform group.
为了完成这个转换，首先必须创建一个FROMSQL转换函数，然后用转换组将转换函数联系起来。
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