10. The computer-implemented method of claim 7 , further comprising: discarding one of the aligned segments from the at least two segment sequences when the one of the aligned segments comprises segments with thea same value and the value is not found in a corpus of table headers that are identified as being meaningful table headers.
7. The computer-implemented method of claim 1 , wherein extracting the hidden attributes comprises: segmenting text associated with the at least one web document from which one of the stitchable tables was extracted to obtain at least two segment sequences, wherein the segment sequences comprise segments; scoring possible segment alignments between the at least two segment sequences; and aligning segments between the at least two segment sequences based on the scoring of the possible segment alignments to obtain aligned segments.