Usually, coordinate values are stored in numeric columns (float, decimal, or even integer), and the specific type will not affect the code presented here.
通常，坐标值存储在数字列中(浮点、小数，甚至是整数)，具体的类型并不影响这里给出的代码。
The second production describes in regex-like fashion more specifically what an integer literal looks like: a contiguous sequence of one or more numeric digits.
第二个结果以类regex的方式更特定地描述了一个整数值看上去象什么：一个或多个数字的连续序列。
Adding methods to Integer allows you to create much more expressive code because you can use real Numbers to represent numeric values.
向Integer添加方法允许您创建更具表达性的代码，因为您可以使用真实的数字表示数值。
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