Attribute data may be either quantitative and expressed numerically or qualitative without numerical magnitudes.
属性资料可能是用数字表达或没有数字的量化。
When the type attribute has a value of currency, the currencyCode attribute can be used to explicitly specify the currency for the numerical value being displayed.
当type属性的值为currency时，currencycode属性可以用来显式地指定所显示的数值的货币单位。
Numerical operations may be performed only on numerical data and hence mainly on quantitative attribute data.
数字的运算主要被用于在数字的资料，在数量的属性资料上被表现。
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