w*****s
发帖数: 122 | 1 In order to appreciate XML, it is important to understand why it was created.
XML was created so that richly structured documents could be used over the
web. The only viable alternatives, HTML and SGML, are not practical for this
purpose.
HTML, as we've already discussed, comes bound with a set of semantics and
does not provide arbitrary structure.
SGML provides arbitrary structure, but is too difficult to implement just for |
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