I'm using Resource Oriented Work Item API 2.0: https://jazz.net/wiki/bin/view/Main/ResourceOrientedWorkItemAPIv2

When using media type "application/atom+xml", I can search only defects and APARs(that's all we need) by using
the following query(searching for "Sensor Failure"):

oslc_cm.query=oslc_cm:searchTerms="Sensor Failure" and dc:type in

# curl -k -b $COOKIES -o "result.out" -H "Accept: application/atom+xml" https://aaa.bbb.ccc.ibm.com:9443/jazz/oslc/contexts/_MNPQRSaIEdyPnMbFLxrS7Q/workitems?oslc_cm%2Equery=oslc_cm%3AsearchTerms%3D%22Sensor%20Failure%22%20and%20dc%3Atype%20in%20%5B%22defect%22%2C%22apar%22%5D

I need to get the following returning properties for each defect/apar:
- id
- title
- type
- last modified
- link to the work item

The problem is that the results do not have the type of the work item.
I am not able to get the type with the URI query parameter oslc_cm.properties=dc:type, dc:identifier,dc:title,dc:modified.
oslc_cm.properties is just ignored.
How can I get the type (defect or apar) of the work item from the query?