GETKEY
GETKEY returns the first occurrence of a specified key from an xml variable.
You can use the asterisk (*)
                           character at the beginning or end of a string as a wildcard. For example, to
                           return particular keys or properties. Asterisks within a string do not act as
                           wildcards. A wildcard search returns only the first matched key or property. 
                           
                           
 
                        	     Note: We cannot guarantee the order in which keys or properties are matched. 
                              
 
                           Syntax
                           =GETKEY("String xml definition", "Key") 
                           		       
Example
This example returns the first key beginning with P from the specified variable:
                           =GETKEYS("String xml definition","P*")