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diff --git a/vendor/easyrdf/easyrdf/lib/EasyRdf/Literal/HexBinary.php b/vendor/easyrdf/easyrdf/lib/EasyRdf/Literal/HexBinary.php
new file mode 100644
index 000000000..7301a1014
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+++ b/vendor/easyrdf/easyrdf/lib/EasyRdf/Literal/HexBinary.php
@@ -0,0 +1,89 @@
+<?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 that represents an RDF Literal of datatype xsd:hexBinary
+ *
+ * @package    EasyRdf
+ * @link       http://www.w3.org/TR/xmlschema-2/#hexBinary
+ * @copyright  Copyright (c) 2009-2013 Nicholas J Humfrey
+ * @license    http://www.opensource.org/licenses/bsd-license.php
+ */
+class EasyRdf_Literal_HexBinary extends EasyRdf_Literal
+{
+    /** Constructor for creating a new xsd:hexBinary literal
+     *
+     * @param  mixed  $value     The value of the literal (already encoded as hexadecimal)
+     * @param  string $lang      Should be null (literals with a datatype can't have a language)
+     * @param  string $datatype  Optional datatype (default 'xsd:hexBinary')
+     * @return object EasyRdf_Literal_HexBinary
+     */
+    public function __construct($value, $lang = null, $datatype = null)
+    {
+        // Normalise the canonical representation, as specified here:
+        // http://www.w3.org/TR/xmlschema-2/#hexBinary-canonical-repr
+        $value = strtoupper($value);
+
+        // Validate the data
+        if (preg_match('/[^A-F0-9]/', $value)) {
+            throw new InvalidArgumentException(
+                "Literal of type xsd:hexBinary contains non-hexadecimal characters"
+            );
+        }
+
+        parent::__construct(strtoupper($value), null, 'xsd:hexBinary');
+    }
+
+    /** Constructor for creating a new literal object from a binary blob
+     *
+     * @param  string $binary  The binary data
+     * @return object EasyRdf_Literal_HexBinary
+     */
+    public static function fromBinary($binary)
+    {
+        return new self( bin2hex($binary) );
+    }
+
+    /** Decode the hexadecimal string into a binary blob
+     *
+     * @return string The binary blob
+     */
+    public function toBinary()
+    {
+        return pack("H*", $this->value);
+    }
+}