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diff --git a/application/libraries/Auth/Yadis/XML.php b/application/libraries/Auth/Yadis/XML.php
new file mode 100644
index 0000000..cf1f5c4
--- /dev/null
+++ b/application/libraries/Auth/Yadis/XML.php
@@ -0,0 +1,352 @@
+<?php
+
+/**
+ * XML-parsing classes to wrap the domxml and DOM extensions for PHP 4
+ * and 5, respectively.
+ *
+ * @package OpenID
+ */
+
+/**
+ * The base class for wrappers for available PHP XML-parsing
+ * extensions.  To work with this Yadis library, subclasses of this
+ * class MUST implement the API as defined in the remarks for this
+ * class.  Subclasses of Auth_Yadis_XMLParser are used to wrap
+ * particular PHP XML extensions such as 'domxml'.  These are used
+ * internally by the library depending on the availability of
+ * supported PHP XML extensions.
+ *
+ * @package OpenID
+ */
+class Auth_Yadis_XMLParser {
+    /**
+     * Initialize an instance of Auth_Yadis_XMLParser with some
+     * XML and namespaces.  This SHOULD NOT be overridden by
+     * subclasses.
+     *
+     * @param string $xml_string A string of XML to be parsed.
+     * @param array $namespace_map An array of ($ns_name => $ns_uri)
+     * to be registered with the XML parser.  May be empty.
+     * @return boolean $result True if the initialization and
+     * namespace registration(s) succeeded; false otherwise.
+     */
+    function init($xml_string, $namespace_map)
+    {
+        if (!$this->setXML($xml_string)) {
+            return false;
+        }
+
+        foreach ($namespace_map as $prefix => $uri) {
+            if (!$this->registerNamespace($prefix, $uri)) {
+                return false;
+            }
+        }
+
+        return true;
+    }
+
+    /**
+     * Register a namespace with the XML parser.  This should be
+     * overridden by subclasses.
+     *
+     * @param string $prefix The namespace prefix to appear in XML tag
+     * names.
+     *
+     * @param string $uri The namespace URI to be used to identify the
+     * namespace in the XML.
+     *
+     * @return boolean $result True if the registration succeeded;
+     * false otherwise.
+     */
+    function registerNamespace($prefix, $uri)
+    {
+        // Not implemented.
+    }
+
+    /**
+     * Set this parser object's XML payload.  This should be
+     * overridden by subclasses.
+     *
+     * @param string $xml_string The XML string to pass to this
+     * object's XML parser.
+     *
+     * @return boolean $result True if the initialization succeeded;
+     * false otherwise.
+     */
+    function setXML($xml_string)
+    {
+        // Not implemented.
+    }
+
+    /**
+     * Evaluate an XPath expression and return the resulting node
+     * list.  This should be overridden by subclasses.
+     *
+     * @param string $xpath The XPath expression to be evaluated.
+     *
+     * @param mixed $node A node object resulting from a previous
+     * evalXPath call.  This node, if specified, provides the context
+     * for the evaluation of this xpath expression.
+     *
+     * @return array $node_list An array of matching opaque node
+     * objects to be used with other methods of this parser class.
+     */
+    function &evalXPath($xpath, $node = null)
+    {
+        // Not implemented.
+    }
+
+    /**
+     * Return the textual content of a specified node.
+     *
+     * @param mixed $node A node object from a previous call to
+     * $this->evalXPath().
+     *
+     * @return string $content The content of this node.
+     */
+    function content($node)
+    {
+        // Not implemented.
+    }
+
+    /**
+     * Return the attributes of a specified node.
+     *
+     * @param mixed $node A node object from a previous call to
+     * $this->evalXPath().
+     *
+     * @return array $attrs An array mapping attribute names to
+     * values.
+     */
+    function attributes($node)
+    {
+        // Not implemented.
+    }
+}
+
+/**
+ * This concrete implementation of Auth_Yadis_XMLParser implements
+ * the appropriate API for the 'domxml' extension which is typically
+ * packaged with PHP 4.  This class will be used whenever the 'domxml'
+ * extension is detected.  See the Auth_Yadis_XMLParser class for
+ * details on this class's methods.
+ *
+ * @package OpenID
+ */
+class Auth_Yadis_domxml extends Auth_Yadis_XMLParser {
+    function Auth_Yadis_domxml()
+    {
+        $this->xml = null;
+        $this->doc = null;
+        $this->xpath = null;
+        $this->errors = array();
+    }
+
+    function setXML($xml_string)
+    {
+        $this->xml = $xml_string;
+        $this->doc = @domxml_open_mem($xml_string, DOMXML_LOAD_PARSING,
+                                      $this->errors);
+
+        if (!$this->doc) {
+            return false;
+        }
+
+        $this->xpath = $this->doc->xpath_new_context();
+
+        return true;
+    }
+
+    function registerNamespace($prefix, $uri)
+    {
+        return xpath_register_ns($this->xpath, $prefix, $uri);
+    }
+
+    function &evalXPath($xpath, $node = null)
+    {
+        if ($node) {
+            $result = @$this->xpath->xpath_eval($xpath, $node);
+        } else {
+            $result = @$this->xpath->xpath_eval($xpath);
+        }
+
+        if (!$result) {
+            $n = array();
+            return $n;
+        }
+
+        if (!$result->nodeset) {
+            $n = array();
+            return $n;
+        }
+
+        return $result->nodeset;
+    }
+
+    function content($node)
+    {
+        if ($node) {
+            return $node->get_content();
+        }
+    }
+
+    function attributes($node)
+    {
+        if ($node) {
+            $arr = $node->attributes();
+            $result = array();
+
+            if ($arr) {
+                foreach ($arr as $attrnode) {
+                    $result[$attrnode->name] = $attrnode->value;
+                }
+            }
+
+            return $result;
+        }
+    }
+}
+
+/**
+ * This concrete implementation of Auth_Yadis_XMLParser implements
+ * the appropriate API for the 'dom' extension which is typically
+ * packaged with PHP 5.  This class will be used whenever the 'dom'
+ * extension is detected.  See the Auth_Yadis_XMLParser class for
+ * details on this class's methods.
+ *
+ * @package OpenID
+ */
+class Auth_Yadis_dom extends Auth_Yadis_XMLParser {
+    function Auth_Yadis_dom()
+    {
+        $this->xml = null;
+        $this->doc = null;
+        $this->xpath = null;
+        $this->errors = array();
+    }
+
+    function setXML($xml_string)
+    {
+        $this->xml = $xml_string;
+        $this->doc = new DOMDocument;
+
+        if (!$this->doc) {
+            return false;
+        }
+
+        if (!@$this->doc->loadXML($xml_string)) {
+            return false;
+        }
+
+        $this->xpath = new DOMXPath($this->doc);
+
+        if ($this->xpath) {
+            return true;
+        } else {
+            return false;
+        }
+    }
+
+    function registerNamespace($prefix, $uri)
+    {
+        return $this->xpath->registerNamespace($prefix, $uri);
+    }
+
+    function &evalXPath($xpath, $node = null)
+    {
+        if ($node) {
+            $result = @$this->xpath->query($xpath, $node);
+        } else {
+            $result = @$this->xpath->query($xpath);
+        }
+
+        $n = array();
+
+        if (!$result) {
+            return $n;
+        }
+
+        for ($i = 0; $i < $result->length; $i++) {
+            $n[] = $result->item($i);
+        }
+
+        return $n;
+    }
+
+    function content($node)
+    {
+        if ($node) {
+            return $node->textContent;
+        }
+    }
+
+    function attributes($node)
+    {
+        if ($node) {
+            $arr = $node->attributes;
+            $result = array();
+
+            if ($arr) {
+                for ($i = 0; $i < $arr->length; $i++) {
+                    $node = $arr->item($i);
+                    $result[$node->nodeName] = $node->nodeValue;
+                }
+            }
+
+            return $result;
+        }
+    }
+}
+
+global $__Auth_Yadis_defaultParser;
+$__Auth_Yadis_defaultParser = null;
+
+/**
+ * Set a default parser to override the extension-driven selection of
+ * available parser classes.  This is helpful in a test environment or
+ * one in which multiple parsers can be used but one is more
+ * desirable.
+ *
+ * @param Auth_Yadis_XMLParser $parser An instance of a
+ * Auth_Yadis_XMLParser subclass.
+ */
+function Auth_Yadis_setDefaultParser($parser)
+{
+    global $__Auth_Yadis_defaultParser;
+    $__Auth_Yadis_defaultParser = $parser;
+}
+
+function Auth_Yadis_getSupportedExtensions()
+{
+    return array('dom'    => 'Auth_Yadis_dom',
+                 'domxml' => 'Auth_Yadis_domxml');
+}
+
+/**
+ * Returns an instance of a Auth_Yadis_XMLParser subclass based on
+ * the availability of PHP extensions for XML parsing.  If
+ * Auth_Yadis_setDefaultParser has been called, the parser used in
+ * that call will be returned instead.
+ */
+function Auth_Yadis_getXMLParser()
+{
+    global $__Auth_Yadis_defaultParser;
+    
+    if (isset($__Auth_Yadis_defaultParser)) {
+        return $__Auth_Yadis_defaultParser;
+    }
+    
+    foreach(Auth_Yadis_getSupportedExtensions() as $extension => $classname)
+    {
+      if (extension_loaded($extension))
+      {
+        $p = new $classname();
+        Auth_Yadis_setDefaultParser($p);
+        return $p;
+      }
+    }
+    
+    return false;
+}
+
+