Returned Type: 
XmlDocument
Returns an XML Document with the following structure:
<?xml version="1.0" encoding="utf-8" ?> 
<furesult>
	<message><![CDATA[ OK ]]></message>
	<creationid>44</creationid>
	<creationresult>0</creationresult>
</furesult>
 
 
Where
    - <message> contains OK or Error description
- <creationid> if the command's result is OK this tag contains the just created new consumer's unique id
- <creationresult> if the command's result is OK this tag contains:
        - 0 (zero) consumer created correctly
- 1 (one) consumer not created.