Description:
------------
Hello,

It seems that SimpleXML removed all references to xsi:type in every node.
XML Parser does show the xsi:type as an attribute.

The code below demonstrates this.

Test script:
---------------
$xmlData = '<root xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" ><node xsi:type="Test">DATA</node></root>';


// Try First with SimpleXml
$xml = simplexml_load_string($xmlData);

echo "Node XSI:TYPE = ". (string)$xml->node['xsi:type'];

// Try using XML Parser
function tag_open($parser, $tag, $attributes) {
   if (!empty($attributes)) { echo "<br /> Tag: $tag Atrributes: ".print_r($attributes,true); }
}

$parser = xml_parser_create();
xml_parser_set_option($parser, XML_OPTION_CASE_FOLDING, false);
xml_set_element_handler($parser, "tag_open", false);
xml_parse($parser, ltrim($xmlData));


Expected result:
----------------
Node XSI:TYPE = Test
Tag: root Atrributes: Array ( [xmlns:xsi] => http://www.w3.org/2001/XMLSchema-instance )
Tag: node Atrributes: Array ( [xsi:type] => Test ) 

Actual result:
--------------
Node XSI:TYPE = 
Tag: root Atrributes: Array ( [xmlns:xsi] => http://www.w3.org/2001/XMLSchema-instance )
Tag: node Atrributes: Array ( [xsi:type] => Test )