3. The non-transitory machine readable medium of claim 2 , wherein the set of instructions for defining the structured document comprises a set of instructions for defining a hierarchical model of the document with the plurality of structural elements comprising nodes in the hierarchical model.
2. The non-transitory machine readable medium of claim 1 , wherein the program further comprises a set of instructions for defining a structured document comprising a plurality of structural elements, the plurality of structural elements including the tabular structural element.