> © or & or ... -- you know, entities. These require a DTD. If the document is anything except HTML or an SGML or XML language, they have no meaning except for the literal sequence of characters. If they are XML only four values are defined, without the browser knowing or parsing the DTD. There is one school of thought that says that, as browsers are not generally validating parsers, that only those four may be safely used in XHTML. There are none pre-defined for SGML and without the specification file, you don't even know what character set numerical entities refer to.
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