diff --git a/lib/private/naturalsort.php b/lib/private/naturalsort.php
index eb00f99a672295fc95b808adc1473b55ee98d824..6e259630f79db6a25e92e634ca580853ca5db929 100644
--- a/lib/private/naturalsort.php
+++ b/lib/private/naturalsort.php
@@ -9,16 +9,6 @@
 
 namespace OC;
 
-class NaturalSort_DefaultCollator {
-
-	public function compare($a, $b) {
-		if ($a === $b) {
-			return 0;
-		}
-		return ($a < $b) ? -1 : 1;
-	}
-}
-
 class NaturalSort {
 	private static $instance;
 	private $collator;
@@ -114,4 +104,3 @@ class NaturalSort {
 		return self::$instance;
 	}
 }
-
diff --git a/lib/private/naturalsort_defaultcollator.php b/lib/private/naturalsort_defaultcollator.php
new file mode 100644
index 0000000000000000000000000000000000000000..e1007f8d7b4d03e042b950eda7ae5d010d23df71
--- /dev/null
+++ b/lib/private/naturalsort_defaultcollator.php
@@ -0,0 +1,19 @@
+<?php
+/**
+ * Copyright (c) 2014 Vincent Petry <PVince81@owncloud.com>
+ * This file is licensed under the Affero General Public License version 3 or
+ * later.
+ * See the COPYING-README file.
+ *
+ */
+
+namespace OC;
+
+class NaturalSort_DefaultCollator {
+	public function compare($a, $b) {
+		if ($a === $b) {
+			return 0;
+		}
+		return ($a < $b) ? -1 : 1;
+	}
+}
diff --git a/lib/public/files/ihomestorage.php b/lib/public/files/ihomestorage.php
new file mode 100644
index 0000000000000000000000000000000000000000..717ef94675076f3382f81b8cc56d9f5d039f98c3
--- /dev/null
+++ b/lib/public/files/ihomestorage.php
@@ -0,0 +1,24 @@
+<?php
+/**
+ * ownCloud
+ *
+ * @author Robin Appelman
+ * @copyright 2012 Robin Appelman icewind@owncloud.com
+ *
+ * This file is licensed under the Affero General Public License version 3 or
+ * later.
+ * See the COPYING-README file.
+ */
+
+/**
+ * Public interface of ownCloud for apps to use.
+ * Files/Storage interface
+ */
+
+// use OCP namespace for all classes that are considered public.
+// This means that they should be used by apps instead of the internal ownCloud classes
+namespace OCP\Files;
+
+interface IHomeStorage {
+
+}
diff --git a/lib/public/files/storage.php b/lib/public/files/storage.php
index 8f8d7852ee426ff3b4bf77f8ec3731c975d0f4e8..323d20db564ee574448aeff584b6785cc8026988 100644
--- a/lib/public/files/storage.php
+++ b/lib/public/files/storage.php
@@ -336,7 +336,3 @@ interface Storage {
 	 */
 	public function instanceOfStorage($class);
 }
-
-interface IHomeStorage {
-
-}
diff --git a/lib/public/share.php b/lib/public/share.php
index 333e0a269707450c40981753e2c873c74131787b..b3ece8fab94a85a7d1ca81481974cd6e3abfd951 100644
--- a/lib/public/share.php
+++ b/lib/public/share.php
@@ -342,86 +342,3 @@ class Share extends \OC\Share\Constants {
 		return \OC\Share\Share::isResharingAllowed();
 	}
 }
-
-/**
- * Interface that apps must implement to share content.
- */
-interface Share_Backend {
-
-	/**
-	 * Check if this $itemSource exist for the user
-	 * @param string $itemSource
-	 * @param string $uidOwner Owner of the item
-	 * @return boolean|null Source
-	 *
-	 * Return false if the item does not exist for the user
-	 */
-	public function isValidSource($itemSource, $uidOwner);
-
-	/**
-	 * Get a unique name of the item for the specified user
-	 * @param string $itemSource
-	 * @param string|false $shareWith User the item is being shared with
-	 * @param array|null $exclude List of similar item names already existing as shared items @deprecated since version OC7
-	 * @return string Target name
-	 *
-	 * This function needs to verify that the user does not already have an item with this name.
-	 * If it does generate a new name e.g. name_#
-	 */
-	public function generateTarget($itemSource, $shareWith, $exclude = null);
-
-	/**
-	 * Converts the shared item sources back into the item in the specified format
-	 * @param array $items Shared items
-	 * @param int $format
-	 * @return TODO
-	 *
-	 * The items array is a 3-dimensional array with the item_source as the
-	 * first key and the share id as the second key to an array with the share
-	 * info.
-	 *
-	 * The key/value pairs included in the share info depend on the function originally called:
-	 * If called by getItem(s)Shared: id, item_type, item, item_source,
-	 * share_type, share_with, permissions, stime, file_source
-	 *
-	 * If called by getItem(s)SharedWith: id, item_type, item, item_source,
-	 * item_target, share_type, share_with, permissions, stime, file_source,
-	 * file_target
-	 *
-	 * This function allows the backend to control the output of shared items with custom formats.
-	 * It is only called through calls to the public getItem(s)Shared(With) functions.
-	 */
-	public function formatItems($items, $format, $parameters = null);
-
-}
-
-/**
- * Interface for share backends that share content that is dependent on files.
- * Extends the Share_Backend interface.
- */
-interface Share_Backend_File_Dependent extends Share_Backend {
-
-	/**
-	 * Get the file path of the item
-	 * @param string $itemSource
-	 * @param string $uidOwner User that is the owner of shared item
-	 * @return string|false
-	 */
-	public function getFilePath($itemSource, $uidOwner);
-
-}
-
-/**
- * Interface for collections of of items implemented by another share backend.
- * Extends the Share_Backend interface.
- */
-interface Share_Backend_Collection extends Share_Backend {
-
-	/**
-	 * Get the sources of the children of the item
-	 * @param string $itemSource
-	 * @return array Returns an array of children each inside an array with the keys: source, target, and file_path if applicable
-	 */
-	public function getChildren($itemSource);
-
-}
diff --git a/lib/public/share_backend.php b/lib/public/share_backend.php
new file mode 100644
index 0000000000000000000000000000000000000000..6ab234aecf0956a25b5b09c67b5ab770ffd72e9e
--- /dev/null
+++ b/lib/public/share_backend.php
@@ -0,0 +1,68 @@
+<?php
+/**
+ * ownCloud
+ *
+ * @author Bjoern Schiessle, Michael Gapczynski
+ * @copyright 2012 Michael Gapczynski <mtgap@owncloud.com>
+ *            2014 Bjoern Schiessle <schiessle@owncloud.com>
+ *
+ * This file is licensed under the Affero General Public License version 3 or
+ * later.
+ * See the COPYING-README file.
+ */
+
+// use OCP namespace for all classes that are considered public.
+// This means that they should be used by apps instead of the internal ownCloud classes
+namespace OCP;
+
+/**
+ * Interface that apps must implement to share content.
+ */
+interface Share_Backend {
+
+	/**
+	 * Check if this $itemSource exist for the user
+	 * @param string $itemSource
+	 * @param string $uidOwner Owner of the item
+	 * @return boolean|null Source
+	 *
+	 * Return false if the item does not exist for the user
+	 */
+	public function isValidSource($itemSource, $uidOwner);
+
+	/**
+	 * Get a unique name of the item for the specified user
+	 * @param string $itemSource
+	 * @param string|false $shareWith User the item is being shared with
+	 * @param array|null $exclude List of similar item names already existing as shared items @deprecated since version OC7
+	 * @return string Target name
+	 *
+	 * This function needs to verify that the user does not already have an item with this name.
+	 * If it does generate a new name e.g. name_#
+	 */
+	public function generateTarget($itemSource, $shareWith, $exclude = null);
+
+	/**
+	 * Converts the shared item sources back into the item in the specified format
+	 * @param array $items Shared items
+	 * @param int $format
+	 * @return TODO
+	 *
+	 * The items array is a 3-dimensional array with the item_source as the
+	 * first key and the share id as the second key to an array with the share
+	 * info.
+	 *
+	 * The key/value pairs included in the share info depend on the function originally called:
+	 * If called by getItem(s)Shared: id, item_type, item, item_source,
+	 * share_type, share_with, permissions, stime, file_source
+	 *
+	 * If called by getItem(s)SharedWith: id, item_type, item, item_source,
+	 * item_target, share_type, share_with, permissions, stime, file_source,
+	 * file_target
+	 *
+	 * This function allows the backend to control the output of shared items with custom formats.
+	 * It is only called through calls to the public getItem(s)Shared(With) functions.
+	 */
+	public function formatItems($items, $format, $parameters = null);
+
+}
diff --git a/lib/public/share_backend_collection.php b/lib/public/share_backend_collection.php
new file mode 100644
index 0000000000000000000000000000000000000000..0292222c74f3e668d101a51bb1c8fdb711c75754
--- /dev/null
+++ b/lib/public/share_backend_collection.php
@@ -0,0 +1,29 @@
+<?php
+/**
+ * ownCloud
+ *
+ * @author Bjoern Schiessle, Michael Gapczynski
+ * @copyright 2012 Michael Gapczynski <mtgap@owncloud.com>
+ *            2014 Bjoern Schiessle <schiessle@owncloud.com>
+ *
+ * This file is licensed under the Affero General Public License version 3 or
+ * later.
+ * See the COPYING-README file.
+ */
+
+// use OCP namespace for all classes that are considered public.
+// This means that they should be used by apps instead of the internal ownCloud classes
+namespace OCP;
+
+/**
+ * Interface for collections of of items implemented by another share backend.
+ * Extends the Share_Backend interface.
+ */
+interface Share_Backend_Collection extends Share_Backend {
+	/**
+	 * Get the sources of the children of the item
+	 * @param string $itemSource
+	 * @return array Returns an array of children each inside an array with the keys: source, target, and file_path if applicable
+	 */
+	public function getChildren($itemSource);
+}
diff --git a/lib/public/share_backend_file_dependent.php b/lib/public/share_backend_file_dependent.php
new file mode 100644
index 0000000000000000000000000000000000000000..b666e504008031f03f4de7670c02e850f6c1d770
--- /dev/null
+++ b/lib/public/share_backend_file_dependent.php
@@ -0,0 +1,31 @@
+<?php
+/**
+ * ownCloud
+ *
+ * @author Bjoern Schiessle, Michael Gapczynski
+ * @copyright 2012 Michael Gapczynski <mtgap@owncloud.com>
+ *            2014 Bjoern Schiessle <schiessle@owncloud.com>
+ *
+ * This file is licensed under the Affero General Public License version 3 or
+ * later.
+ * See the COPYING-README file.
+ */
+
+// use OCP namespace for all classes that are considered public.
+// This means that they should be used by apps instead of the internal ownCloud classes
+namespace OCP;
+
+/**
+ * Interface for share backends that share content that is dependent on files.
+ * Extends the Share_Backend interface.
+ */
+interface Share_Backend_File_Dependent extends Share_Backend {
+	/**
+	 * Get the file path of the item
+	 * @param string $itemSource
+	 * @param string $uidOwner User that is the owner of shared item
+	 * @return string|false
+	 */
+	public function getFilePath($itemSource, $uidOwner);
+
+}
diff --git a/tests/lib/share/backend.php b/tests/lib/share/backend.php
index 61b8f262a42e24f67fddb805533485befb7b8ac1..079582669471beb65718ffe37a607dd75e4d8147 100644
--- a/tests/lib/share/backend.php
+++ b/tests/lib/share/backend.php
@@ -19,8 +19,6 @@
 * License along with this library.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-OC::$CLASSPATH['OCP\Share_Backend']='lib/public/share.php';
-
 class Test_Share_Backend implements OCP\Share_Backend {
 
 	const FORMAT_SOURCE = 0;