GET https://{instance}/{collection}/_apis/wit/workitemrelationtypes?api-version=5.0
{attributes: {…}, referenceName: "System.LinkTypes.Related-Forward", name: "Related", url: null, _links: null}
{attributes: {…}, referenceName: "System.LinkTypes.Hierarchy-Forward", name: "Child", url: null, _links: null}
{attributes: {…}, referenceName: "System.LinkTypes.Hierarchy-Reverse", name: "Parent", url: null, _links: null}
{attributes: {…}, referenceName: "System.LinkTypes.Dependency-Forward", name: "Successor", url: null, _links: null}
{attributes: {…}, referenceName: "System.LinkTypes.Dependency-Reverse", name: "Predecessor", url: null, _links: null}
{attributes: {…}, referenceName: "Microsoft.VSTS.TestCase.SharedStepReferencedBy-Forward", name: "Test
Case", url: null, _links: null}
{attributes: {…}, referenceName: "Microsoft.VSTS.TestCase.SharedStepReferencedBy-Reverse", name: "Shared
Steps", url: null, _links: null}
{attributes: {…}, referenceName: "Microsoft.VSTS.Common.TestedBy-Forward", name: "Tested
By", url: null, _links: null}
{attributes: {…}, referenceName: "Microsoft.VSTS.Common.TestedBy-Reverse", name: "Tests", url: null, _links: null}
{attributes: {…}, referenceName: "System.LinkTypes.Duplicate-Forward", name: "Duplicate", url: null, _links: null}
{attributes: {…}, referenceName: "System.LinkTypes.Duplicate-Reverse", name: "Duplicate
Of", url: null, _links: null}
{attributes: {…}, referenceName: "Microsoft.VSTS.TestCase.SharedParameterReferencedBy-Forward", name: "Referenced
By", url: null, _links: null}
{attributes: {…}, referenceName: "Microsoft.VSTS.TestCase.SharedParameterReferencedBy-Reverse", name: "References", url: null, _links: null}
{attributes: {…}, referenceName: "Hyperlink", name: null, url: null, _links: null}
{attributes: {…}, referenceName: "ArtifactLink", name: null, url: null, _links: null}
{attributes: {…}, referenceName: "Microsoft.VSTS.Common.Affects-Forward", name: "Affected by", url: null, _links: null}
{attributes: {…}, referenceName: "Microsoft.VSTS.Common.Affects-Reverse", name: "Affects", url: null, _links: null}