This feed does not validate.
<dc:date-x-metadatalastmodified>2003-12-13T12:29:29Z</dc:date-x-metadata ...
^
<dc:pubdate>2003-12-13T08:29:29-04:00</dc:pubdate>
^
<dc:created>2003-12-13T12:29:29Z</dc:created>
^
<dc:date-x-metadatalastmodified>2003-12-13T18:30:02Z</dc:date-x-metadata ...
^
In addition, interoperability with the widest range of feed readers could be improved by implementing the following recommendation.
<?xml version="1.0"?>
<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns="http://purl.org/rss/1.0/" xmlns:admin="http://webns.net/mvcb/" xmlns:content="http://purl.org/rss/1.0/modules/content/" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:foaf="http://xmlns.com/foaf/0.1/">
<channel rdf:about="tag:diveintomark.org,2003:3">
<title>dive into mark</title>
<link>http://diveintomark.org/</link>
<description>A lot of effort went into making this effortless</description>
<dc:creator>
<rdf:Bag>
<rdf:li>
<foaf:Person>
<foaf:name>Mark Pilgrim</foaf:name>
<foaf:page>http://diveintomark.org/</foaf:page>
<foaf:mbox>f8dy@example.com</foaf:mbox>
</foaf:Person>
</rdf:li>
</rdf:Bag>
</dc:creator>
<dc:date-x-metadatalastmodified>2003-12-13T12:29:29Z</dc:date-x-metadatalastmodified>
<admin:generatorAgent rdf:resource="http://www.movabletype.org/"/>
<dc:rights>Copyright (c) 2003, Mark Pilgrim</dc:rights>
<items>
<rdf:Seq>
<rdf:li rdf:resource="tag:diveintomark.org,2003:3.2397"/>
</rdf:Seq>
</items>
</channel>
<item rdf:about="tag:diveintomark.org,2003:3.2397">
<title>Atom 0.3 snapshot</title>
<link>http://diveintomark.org/2003/12/13/atom03</link>
<description>The Atom 0.3 snapshot is out. Here are some sample feeds.</description>
<dc:pubdate>2003-12-13T08:29:29-04:00</dc:pubdate>
<dc:created>2003-12-13T12:29:29Z</dc:created>
<dc:date-x-metadatalastmodified>2003-12-13T18:30:02Z</dc:date-x-metadatalastmodified>
<dc:creator>
<foaf:Person>
<foaf:name>Mark Pilgrim</foaf:name>
<foaf:page>http://diveintomark.org/</foaf:page>
<foaf:mbox>f8dy@example.com</foaf:mbox>
</foaf:Person>
</dc:creator>
<dc:contributor>
<rdf:Bag>
<rdf:li>
<foaf:Person>
<foaf:name>Sam Ruby</foaf:name>
<foaf:page>http://intertwingly.net/blog/</foaf:page>
<foaf:mbox>rubys@example.com</foaf:mbox>
</foaf:Person>
</rdf:li>
<rdf:li>
<foaf:Person>
<foaf:name>Joe Gregorio</foaf:name>
<foaf:page>http://bitworking.org/</foaf:page>
<foaf:mbox>joe@example.com</foaf:mbox>
</foaf:Person>
</rdf:li>
</rdf:Bag>
</dc:contributor>
<content:items>
<rdf:Bag>
<rdf:li>
<content:item>
<content:format rdf:resource="http://example.com/content:format#text/plain"/>
<content:encoding rdf:resource="http://example.com/content:encoding#unknown"/>
<dc:language>en-us</dc:language>
<rdf:value><![CDATA[
The Atom 0.3 snapshot is out. Changes from the 0.2 snapshot [http://diveintomark.org/archives/2003/08/05/atom02]: (1) MAY contain feed/info. Free-form info statement that describes the feed format. More explanation of info [http://www.shellen.com/sandbox/atom-info-proposal.html]. (2) Expanded link syntax. All links now include rel, type, and href attributes. (3) Expanded content model. feed/title, feed/tagline, feed/info, feed/copyright, entry/title, and entry/summary can now contain arbitrary data (such as HTML). You must specify the data type in the type attribute, and (for non-XML formats) the escaping mode in the mode attribute. (4) feed/generator now has url and version attributes. The child text is now the human-readable toolkit name. (5) several other changes not listed here.
]]></rdf:value>
</content:item>
</rdf:li>
<rdf:li>
<content:item>
<content:format rdf:resource="http://www.w3.org/1999/xhtml"/>
<content:encoding rdf:resource="http://example.com/content:encoding#unknown"/>
<dc:language>en</dc:language>
<rdf:value><![CDATA[
<div xmlns="http://www.w3.org/1999/xhtml">
<p>The Atom 0.3 snapshot is out. Changes from the <a href="http://diveintomark.org/archives/2003/08/05/atom02">0.2 snapshot</a>:</p>
<ol>
<li>MAY contain <code>feed/info</code>. Free-form info statement that describes the feed format. <a href="http://www.shellen.com/sandbox/atom-info-proposal.html">More explanation of info</a>.</li>
<li>Expanded link syntax. All links now include rel, type, and href attributes.</li>
<li>Expanded content model. <code>feed/title</code>, <code>feed/tagline</code>, <code>feed/info</code>, <code>feed/copyright</code>, <code>entry/title</code>, and <code>entry/summary</code> can now contain arbitrary data (such as HTML). You must specify the data type in the <code>type</code> attribute, and (for non-XML formats) the escaping mode in the <code>mode</code> attribute.</li>
<li><code>feed/generator</code> now has <code>url</code> and <code>version</code> attributes. The child text is now the human-readable toolkit name.</li>
<li>several other changes not listed here</li>
</ol>
</div>
]]></rdf:value>
</content:item>
</rdf:li>
</rdf:Bag>
</content:items>
</item>
</rdf:RDF>