The defmulti macro specifies the dispatch function to use when first invoked and a few other optional features.
defmulti宏指定在初次调用时要使用的分派函数,另外还有其他一些可选特性。
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This will take you most of the way toward writing an sxml2xml utility — one that oddly is not distributed as part of SSAX, not even as a direct function or macro.