Sec.3.3.2 says:
In contrast, n-ary relations [Brickley and Guha, 2014] (Figure 3.8b) connect the source node of the edge directly to the edge node eee with the label of the edge; ...
Here, the most appropriate reference should be [Noy and Rectory, 2006].
Sec.3.3.2 says:
Here, the most appropriate reference should be [Noy and Rectory, 2006].