Syntax for accessing uri for custom attributes in configuration file

Hello All,
    While exporting test cases from excel to RQM via "Export to Repository" , configuration file is selected where custom attributes,category are defined:
Example:
testcase.customAttributes identifier="Comments".name="Comments".type="MEDIUM_STRING".value=O
testcase.customAttributes identifier="Test_Reference".name="Test_Reference".type="MEDIUM_STRING".value=E
testcase.category term="Applied Test Method".value=R

I need to access uri(http://bosch.com/qm/testcase/attribute-type/Test-Reference) for test case Attributes instead of "Comments" / "Test_Reference". Kindly suggest format for the same.