ETM OSLC API for Test Steps with a Validates Requirement link

Greetings,
I am trying to write an OSLC query that retrieves all test steps which are linked to any requirement.
So far, I can get all test steps using:
However, it is possible to do an oslc.where=oslc_qm:validatesRequirement!=""
or something like this to only return steps with any requirement linked?
Thanks in advance.
Accepted answer

No, OSLC Query can't only return results for a property that has any value so you'll have to postprocess and keep the ones with a link.
Haven't tested this but it should work: if there is a limited range of requirements, i.e. specific values, you want to find test cases with requirements links you can use the in syntax like:
oslc.where=oslc_qm:validatesRequirement in [<req1uri>,<req2uri>]
The < and > are part of the required syntax, surrounding the URL.