I am studying his schema but got confused how and to whom "fromid" from link is making a relation with inside urllist? or it is a misprint ? Its chapter 4 Searching and Ranking and figure 4-1. My eyes gone blind for as i have read so much but could not able to understand even the purpose of "fromid".
Here is the Book link as: http://www.uploadmb.com/dw.php?id=1447327761
Please help Thanks.