When a BOM element is directly associated with a single specific XOM element with no transformation required, no explicit mapping between the associated BOM and XOM elements is required.
如果一个BOM元素与某个XOM元素直接关联，不需要转换，那么在相关联的BOM和XOM元素之间就不需要显式的映射。
In XSLT 1.0, either the implementer has to support an extension attribute or the user needs to apply an external (post transformation) process to ensure a BOM is added, or to strip it.
在XSLT 1.0中，要么实现者必须支持扩展属性，要么用户必须进行外部(转换以后)处理，以保证增加或去掉了BOM。
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