1. A method for determining document structure similarity, comprising: segmenting path sequences ( 206 ) of Document Object. Model (DOM) trees ( 120 , 462 ) from a number of web pages ( 202 ) into B components ( 561 ); determining path signals ( 210 ) corresponding to the path sequences ( 206 ) based on a count of the occurrences of particular paths in the B th component ( 571 ); transforming unique path signals ( 210 ) into discrete wavelet signals ( 214 ) ( 572 ); and analyzing the discrete wavelet signals ( 214 ) multiple DOM ee resolution levels ( 573 ).