The ROW data type can be equated to a table definition: it defines multiple columns that are grouped together into a tuple.
ROW数据类型可以等同于一个表定义：它定义可以组成一个元组的多个列。
They are the new data type ROW and the user-defined functions (UDFs).
它们是新数据类型 ROW 和用户定义函数（UDF）。
The ideal situation for base table row storage of XML data is when the table has only one column of XML type and the maximum size of the XML document doesn't exceed the page size.
使用XML数据基础表行存储的理想情形是，当表只有一个xml类型列并且XML文档的最大值没有超过页面大小时。
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