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diff --git a/includes/content/AbstractContent.php b/includes/content/AbstractContent.php
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+<?php
+/**
+ * A content object represents page content, e.g. the text to show on a page.
+ * Content objects have no knowledge about how they relate to Wiki pages.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ * http://www.gnu.org/copyleft/gpl.html
+ *
+ * @since 1.21
+ *
+ * @file
+ * @ingroup Content
+ *
+ * @author Daniel Kinzler
+ */
+
+/**
+ * Base implementation for content objects.
+ *
+ * @ingroup Content
+ */
+abstract class AbstractContent implements Content {
+
+	/**
+	 * Name of the content model this Content object represents.
+	 * Use with CONTENT_MODEL_XXX constants
+	 *
+	 * @since 1.21
+	 *
+	 * @var string $model_id
+	 */
+	protected $model_id;
+
+	/**
+	 * @param string|null $modelId
+	 *
+	 * @since 1.21
+	 */
+	public function __construct( $modelId = null ) {
+		$this->model_id = $modelId;
+	}
+
+	/**
+	 * @see Content::getModel
+	 *
+	 * @since 1.21
+	 */
+	public function getModel() {
+		return $this->model_id;
+	}
+
+	/**
+	 * Throws an MWException if $model_id is not the id of the content model
+	 * supported by this Content object.
+	 *
+	 * @since 1.21
+	 *
+	 * @param string $modelId The model to check
+	 *
+	 * @throws MWException
+	 */
+	protected function checkModelID( $modelId ) {
+		if ( $modelId !== $this->model_id ) {
+			throw new MWException(
+				"Bad content model: " .
+				"expected {$this->model_id} " .
+				"but got $modelId."
+			);
+		}
+	}
+
+	/**
+	 * @see Content::getContentHandler
+	 *
+	 * @since 1.21
+	 */
+	public function getContentHandler() {
+		return ContentHandler::getForContent( $this );
+	}
+
+	/**
+	 * @see Content::getDefaultFormat
+	 *
+	 * @since 1.21
+	 */
+	public function getDefaultFormat() {
+		return $this->getContentHandler()->getDefaultFormat();
+	}
+
+	/**
+	 * @see Content::getSupportedFormats
+	 *
+	 * @since 1.21
+	 */
+	public function getSupportedFormats() {
+		return $this->getContentHandler()->getSupportedFormats();
+	}
+
+	/**
+	 * @see Content::isSupportedFormat
+	 *
+	 * @param string $format
+	 *
+	 * @since 1.21
+	 *
+	 * @return boolean
+	 */
+	public function isSupportedFormat( $format ) {
+		if ( !$format ) {
+			return true; // this means "use the default"
+		}
+
+		return $this->getContentHandler()->isSupportedFormat( $format );
+	}
+
+	/**
+	 * Throws an MWException if $this->isSupportedFormat( $format ) does not
+	 * return true.
+	 *
+	 * @since 1.21
+	 *
+	 * @param string $format
+	 * @throws MWException
+	 */
+	protected function checkFormat( $format ) {
+		if ( !$this->isSupportedFormat( $format ) ) {
+			throw new MWException(
+				"Format $format is not supported for content model " .
+				$this->getModel()
+			);
+		}
+	}
+
+	/**
+	 * @see Content::serialize
+	 *
+	 * @param string|null $format
+	 *
+	 * @since 1.21
+	 *
+	 * @return string
+	 */
+	public function serialize( $format = null ) {
+		return $this->getContentHandler()->serializeContent( $this, $format );
+	}
+
+	/**
+	 * @see Content::isEmpty
+	 *
+	 * @since 1.21
+	 *
+	 * @return boolean
+	 */
+	public function isEmpty() {
+		return $this->getSize() === 0;
+	}
+
+	/**
+	 * @see Content::isValid
+	 *
+	 * @since 1.21
+	 *
+	 * @return boolean
+	 */
+	public function isValid() {
+		return true;
+	}
+
+	/**
+	 * @see Content::equals
+	 *
+	 * @since 1.21
+	 *
+	 * @param Content|null $that
+	 *
+	 * @return boolean
+	 */
+	public function equals( Content $that = null ) {
+		if ( is_null( $that ) ) {
+			return false;
+		}
+
+		if ( $that === $this ) {
+			return true;
+		}
+
+		if ( $that->getModel() !== $this->getModel() ) {
+			return false;
+		}
+
+		return $this->getNativeData() === $that->getNativeData();
+	}
+
+	/**
+	 * Returns a list of DataUpdate objects for recording information about this
+	 * Content in some secondary data store.
+	 *
+	 * This default implementation calls
+	 * $this->getParserOutput( $content, $title, null, null, false ),
+	 * and then calls getSecondaryDataUpdates( $title, $recursive ) on the
+	 * resulting ParserOutput object.
+	 *
+	 * Subclasses may override this to determine the secondary data updates more
+	 * efficiently, preferably without the need to generate a parser output object.
+	 *
+	 * @see Content::getSecondaryDataUpdates()
+	 *
+	 * @param $title Title The context for determining the necessary updates
+	 * @param $old Content|null An optional Content object representing the
+	 *    previous content, i.e. the content being replaced by this Content
+	 *    object.
+	 * @param $recursive boolean Whether to include recursive updates (default:
+	 *    false).
+	 * @param $parserOutput ParserOutput|null Optional ParserOutput object.
+	 *    Provide if you have one handy, to avoid re-parsing of the content.
+	 *
+	 * @return Array. A list of DataUpdate objects for putting information
+	 *    about this content object somewhere.
+	 *
+	 * @since 1.21
+	 */
+	public function getSecondaryDataUpdates( Title $title,
+		Content $old = null,
+		$recursive = true, ParserOutput $parserOutput = null
+	) {
+		if ( $parserOutput === null ) {
+			$parserOutput = $this->getParserOutput( $title, null, null, false );
+		}
+
+		return $parserOutput->getSecondaryDataUpdates( $title, $recursive );
+	}
+
+	/**
+	 * @see Content::getRedirectChain
+	 *
+	 * @since 1.21
+	 */
+	public function getRedirectChain() {
+		global $wgMaxRedirects;
+		$title = $this->getRedirectTarget();
+		if ( is_null( $title ) ) {
+			return null;
+		}
+		// recursive check to follow double redirects
+		$recurse = $wgMaxRedirects;
+		$titles = array( $title );
+		while ( --$recurse > 0 ) {
+			if ( $title->isRedirect() ) {
+				$page = WikiPage::factory( $title );
+				$newtitle = $page->getRedirectTarget();
+			} else {
+				break;
+			}
+			// Redirects to some special pages are not permitted
+			if ( $newtitle instanceOf Title && $newtitle->isValidRedirectTarget() ) {
+				// The new title passes the checks, so make that our current
+				// title so that further recursion can be checked
+				$title = $newtitle;
+				$titles[] = $newtitle;
+			} else {
+				break;
+			}
+		}
+		return $titles;
+	}
+
+	/**
+	 * @see Content::getRedirectTarget
+	 *
+	 * @since 1.21
+	 */
+	public function getRedirectTarget() {
+		return null;
+	}
+
+	/**
+	 * @see Content::getUltimateRedirectTarget
+	 * @note: migrated here from Title::newFromRedirectRecurse
+	 *
+	 * @since 1.21
+	 */
+	public function getUltimateRedirectTarget() {
+		$titles = $this->getRedirectChain();
+		return $titles ? array_pop( $titles ) : null;
+	}
+
+	/**
+	 * @see Content::isRedirect
+	 *
+	 * @since 1.21
+	 *
+	 * @return bool
+	 */
+	public function isRedirect() {
+		return $this->getRedirectTarget() !== null;
+	}
+
+	/**
+	 * @see Content::updateRedirect
+	 *
+	 * This default implementation always returns $this.
+	 *
+	 * @param Title $target
+	 *
+	 * @since 1.21
+	 *
+	 * @return Content $this
+	 */
+	public function updateRedirect( Title $target ) {
+		return $this;
+	}
+
+	/**
+	 * @see Content::getSection
+	 *
+	 * @since 1.21
+	 */
+	public function getSection( $sectionId ) {
+		return null;
+	}
+
+	/**
+	 * @see Content::replaceSection
+	 *
+	 * @since 1.21
+	 */
+	public function replaceSection( $section, Content $with, $sectionTitle = '' ) {
+		return null;
+	}
+
+	/**
+	 * @see Content::preSaveTransform
+	 *
+	 * @since 1.21
+	 */
+	public function preSaveTransform( Title $title, User $user, ParserOptions $popts ) {
+		return $this;
+	}
+
+	/**
+	 * @see Content::addSectionHeader
+	 *
+	 * @since 1.21
+	 */
+	public function addSectionHeader( $header ) {
+		return $this;
+	}
+
+	/**
+	 * @see Content::preloadTransform
+	 *
+	 * @since 1.21
+	 */
+	public function preloadTransform( Title $title, ParserOptions $popts ) {
+		return $this;
+	}
+
+	/**
+	 * @see Content::prepareSave
+	 *
+	 * @since 1.21
+	 */
+	public function prepareSave( WikiPage $page, $flags, $baseRevId, User $user ) {
+		if ( $this->isValid() ) {
+			return Status::newGood();
+		} else {
+			return Status::newFatal( "invalid-content-data" );
+		}
+	}
+
+	/**
+	 * @see Content::getDeletionUpdates
+	 *
+	 * @since 1.21
+	 *
+	 * @param $page WikiPage the deleted page
+	 * @param $parserOutput null|ParserOutput optional parser output object
+	 *    for efficient access to meta-information about the content object.
+	 *    Provide if you have one handy.
+	 *
+	 * @return array A list of DataUpdate instances that will clean up the
+	 *    database after deletion.
+	 */
+	public function getDeletionUpdates( WikiPage $page,
+		ParserOutput $parserOutput = null )
+	{
+		return array(
+			new LinksDeletionUpdate( $page ),
+		);
+	}
+
+	/**
+	 * This default implementation always returns false. Subclasses may override this to supply matching logic.
+	 *
+	 * @see Content::matchMagicWord
+	 *
+	 * @since 1.21
+	 *
+	 * @param MagicWord $word
+	 *
+	 * @return bool
+	 */
+	public function matchMagicWord( MagicWord $word ) {
+		return false;
+	}
+
+	/**
+	 * @see Content::convert()
+	 *
+	 * This base implementation calls the hook ConvertContent to enable custom conversions.
+	 * Subclasses may override this to implement conversion for "their" content model.
+	 *
+	 * @param string  $toModel the desired content model, use the CONTENT_MODEL_XXX flags.
+	 * @param string  $lossy flag, set to "lossy" to allow lossy conversion. If lossy conversion is
+	 * not allowed, full round-trip conversion is expected to work without losing information.
+	 *
+	 * @return Content|bool A content object with the content model $toModel, or false if
+	 * that conversion is not supported.
+	 */
+	public function convert( $toModel, $lossy = '' ) {
+		if ( $this->getModel() === $toModel ) {
+			//nothing to do, shorten out.
+			return $this;
+		}
+
+		$lossy = ( $lossy === 'lossy' ); // string flag, convert to boolean for convenience
+		$result = false;
+
+		wfRunHooks( 'ConvertContent', array( $this, $toModel, $lossy, &$result ) );
+		return $result;
+	}
+}