input: [0] ref [1] Identifies a test (via the id attribute) that is included into this test. That is, the referenced test case is activated when this test case is the current test. Test case referencing is not recursive. Reference multiple tests using nested ref elements. [2] 
output: No
options: R e q u i r e d
options: Y e s
options: N o
options: Y e s , u n l e s s t h e r e s u l t a t t r i b u t e i s o m i t t e d .