An example of how an almost complete package looks like. The format is for an imaginary forum implementation.
Not all settings makes sense, this is just to get an overview of all possible cases.

<?xml version="1.0"?>

<package version="3.2-1" development="true" xmlns:ezpackage="http://ez.no/ezpackage">

 <name>forum</name>

 <summary>Simple forum</summary>

 <description>Creates a simple forum:

* Straight lists</description>

 <vendor>eZ systems</vendor>

 <priority value='9' /> // 1 - 10, 5 is normal, 10 is highest, optional

 <type value='' /> // hotfix, feature, bugfix

 <extension name='forum' /> // name of extension if one should be created, optional

 <ezpublish xmlns:ezpublish="http://ez.no/ezpublish">

   <version>3.2-2</version>

   <named-version>3.2 release 2</named-version>

 </ezpublish>

 <maintainers xmlns:ezmaintainer="http://ez.no/ezpackage">

   <maintainer>

     <name>Jan Borsodi</name>

     <email>jb@ez.no</email>

     <role>lead</role> // lead, developer, tester etc.

   </maintainer>

 </maintainers>

 <packaging xmlns:ezpackaging="http://ez.no/ezpackage">

   <timestamp>32523452345</timestamp>

   <host>jb.ez.no</host>

   <packager>eZ systems. <http://ez.no></packager>

 </packaging>

 <signature type="dsa/sha1">86cd29baf</signature> // optional digital signature

 <source>http://ez.no/developer</source>

 <documents>

   <document type="text/plain">README</document>

   <document audience="end-user" type="text/plain">README-enduser</document>

   <document type="text/plain">INSTALL</document>

   <document type="text/plain" os='win32'>INSTALL-Windows.txt</document>

   <document type="text/html">readme.html</document>

 </documents>

 <groups> // categorization

  <group name="design" />

  <group name="community/forum" />

 </groups>

 <changelog xmlns:ezchangelog="http://ez.no/ezpackage">

   <entry>

     <timestamp>293459235</timestamp>

     <person>Jan Borsodi</person>

     <email>jb@ez.no</email>

     <change>Next/previous on forum lists</change>

     <change>Signatures</change>

   </entry>

 </changelog>

 <release>

   <version xmlns:ezversion="http://ez.no/ezpackage">

     <number>1.5.0</number>

     <release>1</release>

   </version>

   <timestamp>21342345435</timestamp>

   <license>GPL</license>

   <state>stable</state> // pre-alpha, alpha, beta, stable

   <dependencies xmlns:ezdependency="http://ez.no/ezpackage">

     <provides>

       <function name="array_reverse" />

       <symbol name="ezsimpleforum" value="1" />

     </provides>

     <requires>

       <symbol name="ezsimpleforum" value="0" />

       <package name="ezpublish" version="3.2" check="ge" /> // check can be eq, ge, le etc..

       <file name="index.php" md5sum="" />

       <library name="eztemplate" version="3.0" />

       <any>

         <module name="content" view="view" />

         <template name="node/view/full.tpl" design="standard" />

         <all>

           <module name="content" />

           <module name="notification" />

           <module name="content" />

         </all>

       </any>

     </requires>

     <obsoletes>

      <package name="vbulletin" />

     </obsoletes>

     <conflicts>

      <package name="simple-forum" />

     </conflicts>

   <dependencies>

 

   <provides xmlns:ezprovision="http://ez.no/ezpackage">

     <function name="array_change_key_case" />

     <file-list role="template" design="standard">

       <file role="override" md5sum="60f4bee62caad5819386a7083cdf8bef" name="forum.tpl" />

     </file-list>

     <file-list role="image" design="standard">

       <file md5sum="60f4bee62caad5819386a7083cdf8bef" name="size.png"/>

     </file-list>

     <file-list role="css" design="standard">

       <file md5sum="60f4bee62caad5819386a7083cdf8bef" name="forum.css"/>

     </file-list>

   </provides>

 </release>

 <install xmlns:ezinstall="http://ez.no/ezpackage">

   <pre>

     <run type="php" name="setup.php" />

     <run type="shell" os='unix' name="init.sh" />

     <run type="shell" os='win32' name="init.bat" />

     <database import="forum.sql" />

     <database import="forum_common.sql" driver='all' />

     <database>

       <table name="ezforum">

         <field name='id' type='integer' autoincrement="true" />

         <field name='name' type='varchar' size="50" />

       </table>

       <insert>

         <field name='name'>First forum</field>

       </insert>

     </database>

     <part os='unix' directory='objects' file='*.xml' /> // import objects from *.xml files

     <part os='unix'> // import objects from xml structure

      <content-object class='folder'>

         <placement node='root' />

         <attribute name='title'>Forums</attribute>

       </content-object>

     </part>

   </pre>

   <post>

     <operation name="clearcache" clear="template-override" />

   </post>

 </install>

 <uninstall xmlns:ezinstall="http://ez.no/ezpackage">

   <pre>

     <part>

       <content-class>

         <identifier>ezforum</identifier>

       </content-class>

     </part>

   </pre>

   <post>

     <run type="php" name="uninstall.php" />

     <operation name="clearcache" clear="template-override" />

   </post>

 </uninstall>

</package>