A connectedness between two nodes, represented by an arc, with a c-node as one endpoint and another node (which itself may either be generic or of type a, c, t, or r) serving as the x endpoint. A Cx arc specifies that a specific role player (the subject of the node that serves as the x endpoint) is the role player in a casting (the subject of the node that serves as the C endpoint) of that specific role player in a 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 x-node
references should lead readers to the definitions of those items. Helps
prevent confusing and perhaps inaccurate restatement of the definitions
for those items.