13. The method of claim 12 , further comprising: identifying respective associated entities and respective associated attributes that are associated with each of the attributes; determining that a total number of associated entities and a total number of associated attributes associated with both a first attribute and a second, lower-ranked attribute exceeds a specified threshold value; and demoting the second, lower-ranked attribute in the ranking.
12. The method of claim 11 , wherein generating the one or more attribute suggestions comprises: identifying a respective number of references to each attribute in the plurality of resources; ranking the attributes based at least in part on the respective numbers of references; and selecting one or more attributes as being attribute suggestions based on the ranking.