函数format - attrs可能更多表现了Scheme中一般的递归编程，而不仅仅局限于SSAX。
The function format-attrs is probably more an example of generic recursive programming in Scheme than it is specific to SSAX.
知道哪些函数即使你声明了内联也不会内联很重要：比如说虚函数和递归函数在一般情况下不会内联。
It is important to know that functions are not always inlined even if they are declared as such; for example, virtual and recursive functions are not normally inlined.
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