Test Artifact Relationship in ETM
One answer
There is https://jazz.net/wiki/bin/view/Main/CALM2010LinkTypes. However, note that page was last updated 2013-03-20 so is almost 10 years old. While much of that information may be accurate, I know that pages has some errors and needs to be reviewed.
The other source of information is to look at the OSLC Quality Management specification at https://docs.oasis-open-projects.org/oslc-op/qm/v2.1/os/quality-management-shapes.html.