These classes allow the various geometric shapes to be constructed with coordinates of either double or float precision.

这些类允许各种几何图形建立在双精度或浮点精度的坐标系上。

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If you specify the precision to be a value of 23 or less, the FLOAT (val) is equivalent to a REAL; if the precision is between 24 and 53, the FLOAT (val) is equivalent to a DOUBLE.

如果指定了小于等于23的精度值，FLOAT (val)就等价于REAL；如果精度在24和53之间，那么FLOAT (val)等价于DOUBLE。

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For XSD: decimal, XSD: double, and XSD: float types, each platform might have different precision support.

对于xsd： decimal、xsd： double和xsd： float类型，每个平台可能有不同的精度支持。

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