He writes that going off of ISBN Numbers alone won't yield an accurate number, partly because ISBN isn't used in non-Western countries.
他写道只靠“国际标准图书编号”无法得出准确计数，一部分原因在于国际标准图书编号在非西方国家中不被使用。
You derive this component from the type ISBN and restrict an ISBN to a maximum of five digits.
您从类型IS BN派生该组件并限制其IS BN最大为五位。
So @isbn would select all attributes named isbn, not the value of those attributes.
因此，@isbn 将选择所有名为 isbn 属性而不是这些属性的值。
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