Since a calculated expression can be long, and contain characters illegal for XML tags, calculated columns are named simply by their position.
因为计算过的表达式可能很长，并且可能包含对于XML标记来说非法的字符，所以计算过的列仅由它们的位置命名。
Since a calculated expression can be long, and contain characters illegal for XML tags, calculated columns are named simply by their position.
因为计算过的表达式可能很长，并且可能包含对于XML标记来说非法的字符，所以计算过的列仅由它们的位置命名。
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