From an IBM Publishing template, when I'm at a Test Case, how do I explore the parent Test Plan?

[I'm using IBM Publishing version 7.1 and ELM 7.0.2.]
I'm publishing a DOORS Next module that has artifacts linked via 'Validated By' to ETM Test Cases. I need to navigate the link to the Test Case and then publish information about the Test Case's parent Test Plan. How can this be done?
I don't see a way to "look up" to the parent Test Plan natively from the resources exposed by the ETM QM or the ETM Feed data sources in IBM Publishing Document Studio.
Thank you!
One answer

Another option is to extend your ETM feed or create a custom feed that includes the parent Test Plan for each Test Case. This way, the publishing template has access to the Test Plan without needing extra navigation logic in Document Studio. You might need some scripting or a small transformation in XML or XSLT to pull in that hierarchy.