View source for What's new in Joomla 2.5

===Access Controls===
*A thing that can be controlled by permissions is registered in the assets table
*JTable handles this transparently via asset_id field
*For view permissions, support is as simple as adding
<source lang="php">
$user = JFactory::getUser();
$groups = implode(',', $user->authorisedLevels());
$query->where('a.access IN (' . $groups . ')');
</source>

For action permissions, same format as in 1.5:
<source lang="php">
$user->authorise($actionName, $assetName)
</source>
*OpenID library has been removed
*Geshi library moved to plugin folder
*JRegistry notes defaults to JSON (new format), dynamically converting existing data in INI format
*New JStream
*New JApplicationHelper::getComponentName
*Core icons moved to /media/
*Backward incompatible change to JEditor::display
*Added chaining support to JMail
*JFilterInput can no longer be called statically
*JHtml::image now supports relative paths
*All system images are overridable in the default template
*New JHtmlString
*Added wincache session handler for IIS
*New JFilterOutput::stripImages
*JPath::check takes second arg for separator (to pass to JPath::clean)
*Expanded configuration support through config.xml (multiple tabs)

====Core actions====
*core.login.site
*core.login.admin
*core.admin
*core.manage
*core.create
*core.edit
*core.edit.state
*edit.own
*core.delete
*Miscellaneous changes