cahpter12 for dice into python and XML parsing

xml_01.xml

<?xml version='1.0' encoding='utf-8'?>
<feed>
    <title>dive into mark</title>
    <subtitle>currently between addictions</subtitle>
    <id>tag:diveintomark.org,2001?07?29:/</id>
    <updated>2009?03?27T21:56:07Z</updated>
    <link rel='alternate' type='text/html' href='http://diveintomark.org/'/>
    <link rel='self' type='application/atom+xml' href='http://diveintomark.org/feed/'/>
    <entry>
        <author>
            <name>Mark</name>
            <uri>http://diveintomark.org/</uri>
        </author>
        <title>Dive into history, 2009 edition</title>
        <link rel='alternate' type='text/html'
              href='http://diveintomark.org/archives/2009/03/27/dive?into?history?2009?edition'/>
        <id>tag:diveintomark.org,2009?03?27:/archives/20090327172042</id>
        <updated>2009?03?27T21:56:07Z</updated>
        <published>2009?03?27T17:20:42Z</published>
        <category scheme='http://diveintomark.org' term='diveintopython'/>
        <category scheme='http://diveintomark.org' term='docbook'/>
        <category scheme='http://diveintomark.org' term='html'/>
        <summary type='html'>Putting an entire chapter on one page sounds
            bloated, but consider this &amp; my longest chapter so far
            would be 75 printed pages, and it loads in under 5 seconds&amp;hellip;
             On dialup.</summary>
    </entry>
    <entry>
        <author>
            <name>Mark</name>
            <uri>http://diveintomark.org/</uri>
        </author>
        <title>Accessibility is a harsh mistress</title>
        <link> rel='alternate' type='text/html'
        href='http://diveintomark.org/archives/2009/03/21/accessibility‐is‐a‐harsh‐mistress'</link>
        <id>tag:diveintomark.org,2009‐03‐21:/archives/20090321200928</id>
        <updated>2009‐03‐22T01:05:37Z</updated>
        <published>2009‐03‐21T20:09:28Z</published>
        <category> scheme='http://diveintomark.org' term='accessibility'</category>
        <summary> type='html'>The accessibility orthodoxy does not permit people to question the value of features that are rarely useful and rarely used.</summary>
    </entry>
    <entry>
        <author>
            <name>Mark</name>
        </author>
        <title>A gentle introduction to video encoding, part 1: container formats</title>
        <link> rel='alternate' type='text/html'
          href='http://diveintomark.org/archives/2008/12/18/give‐part‐1‐container‐formats'</link>
        <id>tag:diveintomark.org,2008‐12‐18:/archives/20081218155422</id>
        <updated>2009‐01‐11T19:39:22Z</updated>
        <published>2008‐12‐18T15:54:22Z</published>
        <category> scheme='http://diveintomark.org' term='asf'</category>
        <category> scheme='http://diveintomark.org' term='avi'</category>
        <category> scheme='http://diveintomark.org' term='encoding'</category>
        <category> scheme='http://diveintomark.org' term='flv'</category>
        <category> scheme='http://diveintomark.org' term='GIVE'</category>
        <category> scheme='http://diveintomark.org' term='mp4'</category>
        <category> scheme='http://diveintomark.org' term='ogg'</category>
        <category> scheme='http://diveintomark.org' term='video'</category>
        <summary> type='html'>These notes will eventually become part of a tech talk on video encoding.</summary>
    </entry>
</feed>