document: Thresher : automating the unwrapping of semantic content from the World Wide Web We describe Thresher , a system that lets non-technical users teach their browsers how to extract semantic web content from HTML documents on the World Wide Web . Users specify examples of semantic content by highlighting them in a web browser and describing their meaning . We then use the tree edit distance between the DOM subtrees of these examples to create a general pattern , or wrapper , for the content , and allow the user to bind RDF classes and predicates to the nodes of these wrappers . By overlaying matches to these patterns on standard documents inside the Haystack semantic web browser , we enable a rich semantic interaction with existing web pages , `` unwrapping '' semantic data buried in the pages ' HTML . By allowing end-users to create , modify , and utilize their own patterns , we hope to speed adoption and use of the Semantic Web and its applications .
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