The type is defined here:
Where are you getting your NodeSet from?
I know that the RtlsLocationEventType is defined there. I am talking about the reference between it and the corresponding RtlsDeviceType. At the definition of RtlsDeviceType there is missing this line
and at the definition of the RtlsLocationEventType there is missing
<Reference ReferenceType="GeneratesEvent" IsForward="false">ns=1;i=1012</Reference>
like it is defined e.g. for the OcrReaderDeviceType and the corresponding OcrReaderDeviceType.