parid2155] A connectedness between two nodes, with a c-node as one endpoint and a r-node as the other endpoint. A CR arc specifies that a specific role (the subject of the r-node) is the role that is being played in the casting (the subject of the c-node) of a specific role player in that specific role in a specific assertion.

Removed connectedness, see definition of edge below. Further
removed defining of the parts of the definition. The c-node and r-node
references should lead readers to the definitions of those items. Helps
prevent confusing and perhaps inaccurate restatement of the definitions
for those items.