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Please predict whether this patent is acceptable.PATENT ABSTRACT: Example embodiments relate to scalable web data extraction. In example embodiments, a joint potential function is defined for data record segments of web data extracted from a web page, where the joint potential function models data record segmentation of the web data and dependencies between pairs of data segments in the data record segments. At this stage, a principal record segment and several related record segments are identified from the data record segments, where each of the plurality of related record segments is associated with the principal record segment. A related attribute is determined for each related record segment. Next, the joint potential function is applied to the principal record segment and each corresponding related segment to determine a relationship label that describes a data relationship between the principal record segment and the corresponding related segment.