xml installation manifest questions - Joomla! Forum - community, help and support

i trying modify xml installation manifest file, not sure how things done , research has come no information.


below languages, files , administration tags found following:

code: select all

  <modules>
      <module module="mod_lastitems" title="last items" position='left' order="0" client="site">
         <files folder="modules/mod_lastitems">
            <folder>tmpl</folder>
            <file>helper.php</file>
            <file>index.html</file>
            <file>mod_lastitems.php</file>
            <file>mod_lastitems.xml</file>
            <file>en-gb.mod_lastitems.ini</file>
            <file>nl-nl.mod_lastitems.ini</file>
         </files>
         <languages/>
         <media />
      </module>
   </modules>


i add module language file here, , clear can done not sure how.


above this, found <params/> tag. wondering sort of parameters go here. considering extensions being installed have own xml files settings. sure useful tag, don't understand how.


near bottom, found this:

code: select all

   <check>
      <directory>/modules</directory>
      <directory>/plugins/content</directory>
      <extension name="mod_lastitems"  type="modules" field="published" value="1">module='mod_lastitems'</extension>
   </check>
</install>


i wonder for. not understand why modules directory listed plus module extension, while plugin not listed extension. and, why component , languages not listed here?
furthermore, seeing there field="published" value="1" in module extension tag, wonder if possible other settings there too?


seeing installation file getting impression powerful tool package installation grateful if can add knowledge inspiration. in advance!

perhaps http://docs.joomla.org/using_the_installer_api_to_support_package_installation