Rename attribute3 to productID and leave string as the type.
将 attribute3重命名为 productID，并保留 string 类型。
The for clause binds variable $p to each of these ProductID values in turn.
for 子句依次将变量 $p绑定到每个ProductID值。
The return clause constructs a new product element for each distinct ProductID value.
return子句为每个不同的productid值构造一个新的“product”元素。
Since PRODUCTID (SALESFACT) is in sales facts, use the attributes on the left side of the join.
因为PRODUCTID (SALESFACT)属于sales事实，所以在联结的左边使用这个属性。
Since attribute PRODUCTID (product) is in the product dimension, use the attributes on the right side of the join.
因为属性PRODUCTID (product)属于product维，所以在联结的右边使用这个属性。
The distinct-values function in the for clause returns a list of all the distinct values of ProductID that are found inside comments in the comments column of the Items table.
for子句中的distinct -values函数返回一个列表，其中包含在items表的comments列中的所有Comment中发现的所有不同的productid值。
Through the schema, a validating parser can verify that the element InvoiceNo is a positive integer and the element ProductID consists of one letter between A and Z followed by six digits.
通过模式，验证解析器可以检查元素InvoiceNo 是否是正整数，元素ProductID 的首字符是否为A到 Z之间的字母，后面为六个阿拉伯数字。
Through the schema, a validating parser can verify that the element InvoiceNo is a positive integer and the element ProductID consists of one letter between A and Z followed by six digits.
通过模式，验证解析器可以检查元素InvoiceNo 是否是正整数，元素ProductID 的首字符是否为A到 Z之间的字母，后面为六个阿拉伯数字。
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