SGML和XML的异同?
SGML is more customizable (thus flexible and more "powerful") at the expense of being (much) more expensive to implement. In an SGML language you could say <COVER PAGES>, whereas in XML this construct could not be DTD valid.
SGML DTD 到 XML DTD的转换
SGML 文档 到 XML 文档的转换
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