BC mode allows certain automatic type conversions to occur, as well as automatic selection of the first member of a node-set.
BC模式允许进行某些自动类型转换和自动选择节点集的第一个成员。
If the BC feature is available, you can set version 1.0 to be in effect for an element with expression evaluation, eliminating worry about type mismatches.
如果支持BC特性，可以设置version 1.0让它在表达式求值的元素中生效，这样就不用担心类型匹配问题了。
BC mode impacts numeric comparisons in two ways: allowing selection of the first member of a set and obtaining NaN for a non-numeric value, rather than throwing a type error.
BC模式对数字比较的影响有两个方面：允许选择集合的第一个成员，对于非数字值返回NaN而不是抛出类型错误。
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