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diff --git a/vendor/easyrdf/easyrdf/lib/EasyRdf/Serialiser/Json.php b/vendor/easyrdf/easyrdf/lib/EasyRdf/Serialiser/Json.php
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+++ b/vendor/easyrdf/easyrdf/lib/EasyRdf/Serialiser/Json.php
@@ -0,0 +1,72 @@
+<?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
+ */
+
+/**
+ * Class to serialise an EasyRdf_Graph to RDF/JSON
+ * with no external dependancies.
+ *
+ * @package    EasyRdf
+ * @copyright  Copyright (c) 2009-2013 Nicholas J Humfrey
+ * @license    http://www.opensource.org/licenses/bsd-license.php
+ */
+class EasyRdf_Serialiser_Json extends EasyRdf_Serialiser_RdfPhp
+{
+    /**
+     * Method to serialise an EasyRdf_Graph to RDF/JSON
+     *
+     * http://n2.talis.com/wiki/RDF_JSON_Specification
+     * docs/appendix-a-rdf-formats-json.md
+     *
+     * @param EasyRdf_Graph $graph   An EasyRdf_Graph object.
+     * @param string        $format  The name of the format to convert to.
+     * @param array         $options
+     * @throws EasyRdf_Exception
+     * @return string The RDF in the new desired format.
+     */
+    public function serialise($graph, $format, array $options = array())
+    {
+        parent::checkSerialiseParams($graph, $format);
+
+        if ($format != 'json') {
+            throw new EasyRdf_Exception(
+                "EasyRdf_Serialiser_Json does not support: $format"
+            );
+        }
+
+        return json_encode(parent::serialise($graph, 'php'));
+    }
+}