I have a xml document which right now is not even recognized as xml on IE9. I have tried adding correct xmlns:xsl attribute, also it has a correct header starting with 

```
<?xml version="1.0" encoding="UTF-8"?>

```

This xml renders perfectly in IE 6 7 8 but does not work in IE9.
I am not sure if it is Quirks mode related issue, and if it is I am not sure what DOCTYPE is should use for XML documents. 
Any help will be greatly appreciated.
Following is the first few lines of XML document.

```
<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet type="text/xsl" href="/mobiledoc/jsp/empi/master/CCD.xsl" ?>
<ClinicalDocument xmlns="urn:hl7-org:v3" 
                  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
                  xmlns:sdtc="urn:hl7-org:sdtc" 
                  xmlns:xsl="http://www.w3.org/1999/XSL/Transform" 
                  xsi:schemaLocation="urn:hl7-org:v3 http://xreg2.nist.gov:8080/hitspValidation/schema/cdar2c32/infrastructure/cda/C32_CDA.xsd" 
                  classCode="DOCCLIN" 
                  moodCode="EVN">

```