19. The device of claim 14 , wherein affiliation among the documents in the affiliated set of documents is defined based on a binary model of affiliation.
14. A device comprising: a set location component to identify documents, where a first one of the documents is linked by a second one of the documents and the second document is one of a plurality of documents in an affiliated set of documents; and a ranking component that assigns a ranking score to the first document by: calculating a first value for each document in the affiliated set of documents based on a ranking score of the document and a number of outbound links from the document; calculating a second value as one of the first values for the documents in the affiliated set of documents; assigning a ranking score to the first document based the second value, where the ranking component assigns the ranking score by: determining whether the documents in the affiliated set of documents are weakly affiliated or strongly affiliated, and setting the amount that the second document contributes to the ranking score of the first document as a function that acts as a summation operator over the affiliated set of documents when the affiliated set is weakly affiliated and as a maximum operator over the affiliated set of documents when the affiliated set is strongly affiliated, where the function is defined as: 
 (CONTRIB(D 1 ) a +CONTRIB(D 2 ) a + . . . +CONTRIB(D k ) a ) 1/a , where CONTRIB for document D k represents an individual ranking score contribution for document k in the affiliated set, and a is defined as 1 ⅇ + ( 1 - ⅇ ) ⁢ γ , where e is a predetermined constant and γ represents a continuous measure of the affiliation of the documents in the affiliated set; and storing the ranking score.