A working example with the caveat that it's currently marked as a provisional service and may change in the next release:

In the rootservices document:
https://jazz.net/jazz/rootservices

You'll find a section like this:
-- Project areas service. This service is provisional and may change in the next release. --
<jp06:projectAreas rdf:resource="https://jazz.net/jazz/process/project-areas"/>
Use that resource to lookup the project areas.
Within the project-areas service document, locate the project area you're interested in, say "Rational Team Concert" and locate the timelines-url, in this case:
https://jazz.net/jazz/process/project-areas/_1w8aQEmJEduIY7C8B09Hyw/timelines

From here you'll be able to find the iterations for a specific timeline, such as "development":
https://jazz.net/jazz/process/project-areas/_1w8aQEmJEduIY7C8B09Hyw/timelines/_p9eEIGNoEdy7bvk2zwD5rw/iterations

And the child iterations of the RTC 6.0 iteration here:
https://jazz.net/jazz/process/project-areas/_1w8aQEmJEduIY7C8B09Hyw/timelines/_p9eEIGNoEdy7bvk2zwD5rw/iterations/_g_8A0EmGEeS8I8_tB4YpVQ/children

Shawn

https://localhost:9443/ccm/process/project-areas/-Cg8zv7AEeS61Oblf7UzOg/timelines/-T3Ldf7AEeS61Oblf7UzOg/iterations/-T3Ldv7AEeS61Oblf7UzOg
and trying to put it in the oslc query like:
 <rtc_cm:plannedFor rdf:resource="https://localhost:9443/ccm/process/project-areas/-Cg8zv7AEeS61Oblf7UzOg/timelines/-T3Ldf7AEeS61Oblf7UzOg/iterations/-T3Ldv7AEeS61Oblf7UzOg"/>
But I am getting 409 error while creating that workitem.

Thanks,
Sud

<rtc_cm:plannedFor rdf:resource="https://localhost:9443/ccm/oslc/iterations/_-T3Ldv7AEeS61Oblf7UzOg"/>;