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Not sure if it will work, but maybe you should try /RaionResponse/MunicipalUnions as your context and /MunicipalUnion/@Id, /MunicipalUnion/@Name, /MunicipalUnion/@TypeMU as your queries
/RaionResponse/MunicipalUnions
as your context and/MunicipalUnion/@Id
,/MunicipalUnion/@Name
,/MunicipalUnion/@TypeMU
as your queries