document: Highly efficient algorithms for structural clustering of large websites In this paper , we present a highly scalable algorithm for structurally clustering webpages for extraction . We show that , using only the URLs of the webpages and simple content features , it is possible to cluster webpages effectively and efficiently . At the heart of our techniques is a principled framework , based on the principles of information theory , that allows us to effectively leverage the URLs , and combine them with content and structural properties . Using an extensive evaluation over several large full websites , we demonstrate the effectiveness of our techniques , at a scale unattainable by previous techniques .
doc_bio_tags: O O O O B I O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O