W3C 
XML
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<title>Simple XML/title>
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XML</a></p>
<h1>Simple XML</h1>
<p>This simplified version on XML is a variant of the proposed <a
href="/pub/WWW/TR/WD-xml">XML language</a>. It removes some features
and adds a few others. It mainly differs from XML in these aspects:</p>
<ul>
<li><p>Seperation between lexical part and grammar part means that is
much easier to parse. The grammar has just 16 productions and is
LL(1).</p></li>
<li><p>There is no distinction between <;foo></foo> and
<foo/>, they can be used interchangeably.</p></li>
<li><p>Documents can be nested: there may be <!doctype>
declarations in the middle of a document.</p></li>
<li><p>Default attribute declarations are scoped: they are valid until
the end of the current element or doctype.</p></li>
<li><p>Whitespace handling is simplified: a newline immediately before a `<'
and a newline immediately after a `>' are ignored; no other
whitespace is ignored by the parser (i.e., all other whitespace is
passed on to the application).</p></li>
<li><p>Only character entities are allowed, no other types of entities
exist.</p></li>
<li><p>There is no internal document type subset. The allowed
structure of the document can only be specified in a separate
document.</p></li>
</ul>
<h2>Examples</h2>
<p>A few examples of XML files:</p>
<ol>
<li><p><a href="example1.html">A document</a> with all the information
in the attributes.</p></li>
<li><p><a href="example2.html">The current document</a> in XML syntax.</p></li>
</ol>
<p>I'm still working on a replacement for the DTD syntax, that would
allow content models and attribute sets for elements to differ based
on context. It would basically be an EBNF variant, with a few handy
abbreviations for common constructs like start tags and end tags.</p>
<hr/>
<address><a href="mailto:bert@w3.org">Bert Bos</a></address>
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Note that there isn't much difference between the HTML and XML versions.
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