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diff --git a/SemanticMediaWiki/includes/interfaces/ObjectDictionary.php b/SemanticMediaWiki/includes/interfaces/ObjectDictionary.php
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+<?php
+
+namespace SMW;
+
+/**
+ * Interface specifying methods for an accessible object
+ *
+ * @ingroup SMW
+ *
+ * @licence GNU GPL v2+
+ * @since 1.9
+ *
+ * @author mwjames
+ */
+interface Accessible {
+
+	/**
+	 * Returns whether a specific element is accessible
+	 *
+	 * @since 1.9
+	 *
+	 * @param  mixed $key specific key
+	 *
+	 * @return boolean
+	 */
+	public function has( $key );
+
+	/**
+	 * Returns a element for a specific key
+	 *
+	 * @since 1.9
+	 *
+	 * @param  mixed $key specific key
+	 *
+	 * @return mixed
+	 */
+	public function get( $key );
+
+}
+
+/**
+ * Interface specifying methods for a changeable object
+ *
+ * @ingroup Utility
+ */
+interface Changeable {
+
+	/**
+	 * Adds an new element (key, value pair) to an existing collection
+	 *
+	 * @since 1.9
+	 *
+	 * @param  mixed $key
+	 * @param  mixed $value
+	 */
+	public function set( $key, $value );
+
+	/**
+	 * Removes an element from a collection
+	 *
+	 * @since 1.9
+	 *
+	 * @param  mixed $key specific key
+	 */
+	public function remove( $key );
+
+}
+
+/**
+ * Interface specifying methods for a combinable object
+ *
+ * @ingroup Utility
+ */
+interface Combinable {
+
+	/**
+	 * Returns an array
+	 *
+	 * @since 1.9
+	 *
+	 * @return array
+	 */
+	public function toArray();
+
+	/**
+	 * Merges elements of one or more arrays together
+	 *
+	 * @since 1.9
+	 *
+	 * @param array $mergeable
+	 */
+	public function merge( array $mergeable );
+
+}
+
+/**
+ * Interface specifying an object dictionary
+ *
+ * @ingroup Utility
+ */
+interface ObjectDictionary extends Accessible, Changeable, Combinable {}