Data Extraction Using Templates

Systems and techniques for extracting data from unstructured documents are described. One such method involves assigning one or more labels to one or more nodes in a first object model of a first web page; comparing a second object model of a second web page to the first object model; if the first object model matches the second object model to a determined degree, extracting from the second web page data associated with nodes in the second object model that match labeled nodes in the first object model; and providing the extracted data for storage in a structured database in a manner associated with the labels.