1. A method comprising: identifying a first data set having a first hierarchical structure; identifying a second data set, wherein the second data set represents a modification of at least a portion of the first data set; performing a query over at least a portion of the first data set and at least a portion of the second data set, thereby generating a query results set; and providing a representation of at least a portion of the first data set and at least a portion of the second data set, based upon, at least in part, the query results set.