对于工厂组装装置，用长度代码更换型号中最后的3个零。请参阅热塑性塑料阀门、过滤器和附件，价格目录V-1了解长度代码。

For factory assembled units replace last 3 zeros with length code. See Thermoplastic Valves, Strainers & Accessories, Price Schedule V-1 for length codes.

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除了输入字符串之外，SUBSTRING函数还有其他三个参数，它们分别是：起始位置、长度和代码单元指定。

Along with the input string, the SUBSTRING function has three other arguments, which are start position, length, and code unit specification.

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如果将该字符串设置为无效长度的值，该代码没有问题，但是生成的XML将无法通过验证。

If the string is set to a value with an invalid length, the code is OK, but the XML generated fails validation.

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