How to Populate the Dropdown from the xml file ?

Hi,
According to my requirement, Drop down has to be populated in a form, on selecting an element in the first drop down list, corresponding second drop down values has to be loaded dynamically.
I am using the ReferenceData file, which consists of the Dropdown list values in the form of Key,Value pair. I can able to populate one drop down,but I don't know how to populate the second dropdown dynamically.
can any one please help me to finish this task.

Thanxs john.
My requirement is onChange of a value from the first drop down, particular values needs to load in the second drop down. Values that needs to pull are designed in XML Object as Map entries Key,Pair Values.
I already did all the things, what you have told.But,I don't know How to populate the second drop down, and where to write the condition.
If u don't mind can u send me the sample code to check the condition.

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