1. A method of mining Web applications, the method stored as computer readable instructions on a computer readable media and executed by a processor, the method comprising: selecting a distance measure between subtrees of the Web applications according to a bottom-up approach; computing an edit distance for the subtrees; and finding sets of similar subtrees using the edit distance with a Similar Sibling-Trees-aware Restricted Top-Down edit Metric (RTDM) (SiSTeR) approach, wherein the SiSTeR approach detects a plurality of lists of different length as similar while disregarding a number of entries within each of the plurality of lists individually, and wherein finding similar structures in the Web applications disregards dissimilarity affected only by a number of sibling sub-trees.