Both graphRef and groupRef can be both be renamed as elementRef. This is simplification is possible because Pathway elements have either just graphRef or groupRef. In previous change, Group.groupId and Group.graphId was merged and renamed elementId. Reasoning behind this simplification is similar.
Attribute-->Property name-->title
graphId-->elementId graphRef, groupRef-->elementRef
Both graphRef and groupRef can be both be renamed as elementRef. This is simplification is possible because Pathway elements have either just graphRef or groupRef. In previous change, Group.groupId and Group.graphId was merged and renamed elementId. Reasoning behind this simplification is similar.