How Do I select Multiple XML Tag values in in SQL query

Hi Team,

PLease let me know how do I select multiple values in XML Tag in SQL query.

 

For example

select Reference,NULLIF(MethodDetail.value('(//CheckNumber)[1]','nvarchar(20)'),'') as CheckNumber,Amount from RefundPayment where reference ='123434'

 

Here  MethodDetail Column value could be either of one of the mentioned below XML :-

 So in that case please let me know If some time some policy will have value as CheckNumber (which I am already retreiving) some time Card number as mentioned below, please let me know how do I choose either of one value while doing select statement

 

Note:- for the Policy its always either of on evalue will be present , it will never have both the values.