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diff --git a/www/wiki/extensions/SemanticMediaWiki/includes/dataitems/DIConcept.php b/www/wiki/extensions/SemanticMediaWiki/includes/dataitems/DIConcept.php
new file mode 100644
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+++ b/www/wiki/extensions/SemanticMediaWiki/includes/dataitems/DIConcept.php
@@ -0,0 +1,200 @@
+<?php
+
+namespace SMW;
+
+use SMWDataItem;
+
+/**
+ * This class implements Concept data items.
+ *
+ * @note These special data items for storing concept declaration data in SMW
+ * should vanish at some point since Container values could encode this data
+ * just as well.
+ *
+ * @since 1.6
+ *
+ * @ingroup SMWDataItems
+ *
+ * @author Markus Krötzsch
+ * @author mwjames
+ */
+class DIConcept extends \SMWDataItem {
+
+	/**
+	 * Query string for this concept. Possibly long.
+	 * @var string
+	 */
+	protected $m_concept;
+	/**
+	 * Documentation for this concept. Possibly long.
+	 * @var string
+	 */
+	protected $m_docu;
+	/**
+	 * Flags of query features.
+	 * @var integer
+	 */
+	protected $m_features;
+	/**
+	 * Size of the query.
+	 * @var integer
+	 */
+	protected $m_size;
+	/**
+	 * Depth of the query.
+	 * @var integer
+	 */
+	protected $m_depth;
+
+	/**
+	 * Status
+	 * @var integer
+	 */
+	protected $cacheStatus;
+
+	/**
+	 * Date
+	 * @var integer
+	 */
+	protected $cacheDate;
+
+	/**
+	 * Count
+	 * @var integer
+	 */
+	protected $cacheCount;
+
+	/**
+	 * @param string $concept the concept query string
+	 * @param string $docu user documentation
+	 * @param integer $queryefeatures flags about query features
+	 * @param integer $size concept query size
+	 * @param integer $depth concept query depth
+	 */
+	public function __construct( $concept, $docu, $queryfeatures, $size, $depth ) {
+		$this->m_concept  = $concept;
+		$this->m_docu     = $docu;
+		$this->m_features = $queryfeatures;
+		$this->m_size     = $size;
+		$this->m_depth    = $depth;
+	}
+
+	public function getDIType() {
+		return SMWDataItem::TYPE_CONCEPT;
+	}
+
+	public function getConceptQuery() {
+		return $this->m_concept;
+	}
+
+	public function getDocumentation() {
+		return $this->m_docu;
+	}
+
+	public function getQueryFeatures() {
+		return $this->m_features;
+	}
+
+	public function getSize() {
+		return $this->m_size;
+	}
+
+	public function getDepth() {
+		return $this->m_depth;
+	}
+
+	public function getSortKey() {
+		return $this->m_docu;
+	}
+
+	public function getSerialization() {
+		return serialize( $this );
+	}
+
+	/**
+	 * Sets cache status
+	 *
+	 * @since 1.9
+	 *
+	 * @param string
+	 */
+	public function setCacheStatus( $status ) {
+		$this->cacheStatus = $status;
+	}
+
+	/**
+	 * Sets cache date
+	 *
+	 * @since 1.9
+	 *
+	 * @param string
+	 */
+	public function setCacheDate( $date ) {
+		$this->cacheDate = $date;
+	}
+
+	/**
+	 * Sets cache count
+	 *
+	 * @since 1.9
+	 *
+	 * @param int
+	 */
+	public function setCacheCount( $count ) {
+		$this->cacheCount = $count;
+	}
+
+	/**
+	 * Returns cache status
+	 *
+	 * @since 1.9
+	 *
+	 * @return string
+	 */
+	public function getCacheStatus() {
+		return $this->cacheStatus;
+	}
+
+	/**
+	 * Returns cache date
+	 *
+	 * @since 1.9
+	 *
+	 * @return string
+	 */
+	public function getCacheDate() {
+		return $this->cacheDate;
+	}
+
+	/**
+	 * Returns cache count
+	 *
+	 * @since 1.9
+	 *
+	 * @return int
+	 */
+	public function getCacheCount() {
+		return $this->cacheCount;
+	}
+
+	/**
+	 * Create a data item from the provided serialization string and type
+	 * ID.
+	 * @return DIConcept
+	 */
+	public static function doUnserialize( $serialization ) {
+		$result = unserialize( $serialization );
+		if ( $result === false ) {
+			throw new DataItemException( "Unserialization failed." );
+		}
+		return $result;
+	}
+
+	public function equals( SMWDataItem $di ) {
+		if ( $di->getDIType() !== SMWDataItem::TYPE_CONCEPT ) {
+			return false;
+		}
+		return $di->getSerialization() === $this->getSerialization();
+	}
+
+}