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diff --git a/vendor/easyrdf/easyrdf/lib/EasyRdf/Serialiser.php b/vendor/easyrdf/easyrdf/lib/EasyRdf/Serialiser.php
new file mode 100644
index 000000000..1c0acb84a
--- /dev/null
+++ b/vendor/easyrdf/easyrdf/lib/EasyRdf/Serialiser.php
@@ -0,0 +1,116 @@
+<?php
+
+/**
+ * EasyRdf
+ *
+ * LICENSE
+ *
+ * Copyright (c) 2009-2013 Nicholas J Humfrey.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. The name of the author 'Nicholas J Humfrey" may be used to endorse or
+ *    promote products derived from this software without specific prior
+ *    written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * @package    EasyRdf
+ * @copyright  Copyright (c) 2009-2013 Nicholas J Humfrey
+ * @license    http://www.opensource.org/licenses/bsd-license.php
+ */
+
+/**
+ * Parent class for the EasyRdf serialiser
+ *
+ * @package    EasyRdf
+ * @copyright  Copyright (c) 2009-2013 Nicholas J Humfrey
+ * @license    http://www.opensource.org/licenses/bsd-license.php
+ */
+class EasyRdf_Serialiser
+{
+    protected $prefixes = array();
+
+    public function __construct()
+    {
+    }
+
+    /**
+     * Keep track of the prefixes used while serialising
+     * @ignore
+     */
+    protected function addPrefix($qname)
+    {
+        list ($prefix) = explode(':', $qname);
+        $this->prefixes[$prefix] = true;
+    }
+
+    /**
+     * Check and cleanup parameters passed to serialise() method
+     * @ignore
+     */
+    protected function checkSerialiseParams(&$graph, &$format)
+    {
+        if (is_null($graph) or !is_object($graph) or !($graph instanceof EasyRdf_Graph)) {
+            throw new InvalidArgumentException(
+                "\$graph should be an EasyRdf_Graph object and cannot be null"
+            );
+        }
+
+        if (is_null($format) or $format == '') {
+            throw new InvalidArgumentException(
+                "\$format cannot be null or empty"
+            );
+        } elseif (is_object($format) and ($format instanceof EasyRdf_Format)) {
+            $format = $format->getName();
+        } elseif (!is_string($format)) {
+            throw new InvalidArgumentException(
+                "\$format should be a string or an EasyRdf_Format object"
+            );
+        }
+    }
+
+    /**
+     * Protected method to get the number of reverse properties for a resource
+     * If a resource only has a single property, the number of values for that
+     * property is returned instead.
+     * @ignore
+     */
+    protected function reversePropertyCount($resource)
+    {
+        $properties = $resource->reversePropertyUris();
+        $count = count($properties);
+        if ($count == 1) {
+            $property = $properties[0];
+            return $resource->countValues("^<$property>");
+        } else {
+            return $count;
+        }
+    }
+
+    /**
+     * Sub-classes must follow this protocol
+     * @ignore
+     */
+    public function serialise($graph, $format, array $options = array())
+    {
+        throw new EasyRdf_Exception(
+            "This method should be overridden by sub-classes."
+        );
+    }
+}