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。
Either way, the mapping is explicit and has to be modified every time a refactoring takes place.
不管通过何种方式，这种映射是显式的，每当发生重构时，都必须作出修改。
JAX-RPC mapping of explicit and implicit headers.
显式和隐式消息头的JAX - RPC映射。
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