9. A document annotation or structuring system comprising: a reference identification and resolution module comprising a digital processor configured to identify reference text fragments in a document and associate referenced object text fragments in the document with the identified reference text fragments using a method comprising: identifying a set of candidate object text fragments from the document, each candidate object text fragment including at least a reference number, the set of candidate object text fragments including both object text fragments and reference text fragments, the identifying not differentiating between object text fragments and reference text fragments; deriving reference profiles from the set of candidate object text fragments, each reference profile including at least a reference number and an object type indicator; pairing reference profiles with object text fragments selected from the set of candidate object text fragments, each pair having a same reference number for the paired reference profile and the object text fragment, wherein the pairing includes: assigning likelihood scores to pairings of reference profiles and candidate object text fragments having matching reference numbers; and selecting the object text fragments for pairing with reference profiles based on the likelihood scores subject to a constraint that the pairings be one-to-one in which no reference profile is paired with more than one object text fragment and no object text fragment is paired with more than one reference profile; matching reference text fragments in the document with reference profiles by reference number and object type; and associating matched reference text fragments with object text fragments paired with the matching reference profiles; and a document annotation or structuring module configured to annotate or structure the document based on the reference text fragments and referenced object text fragments output by the reference identification and resolution module.
9. A document annotation or structuring system comprising: a reference identification and resolution module comprising a digital processor configured to identify reference text fragments in a document and associate referenced object text fragments in the document with the identified reference text fragments using a method comprising: identifying a set of candidate object text fragments from the document, each candidate object text fragment including at least a reference number, the set of candidate object text fragments including both object text fragments and reference text fragments, the identifying not differentiating between object text fragments and reference text fragments; deriving reference profiles from the set of candidate object text fragments, each reference profile including at least a reference number and an object type indicator; pairing reference profiles with object text fragments selected from the set of candidate object text fragments, each pair having a same reference number for the paired reference profile and the object text fragment, wherein the pairing includes: assigning likelihood scores to pairings of reference profiles and candidate object text fragments having matching reference numbers; and selecting the object text fragments for pairing with reference profiles based on the likelihood scores subject to a constraint that the pairings be one-to-one in which no reference profile is paired with more than one object text fragment and no object text fragment is paired with more than one reference profile; matching reference text fragments in the document with reference profiles by reference number and object type; and associating matched reference text fragments with object text fragments paired with the matching reference profiles; and a document annotation or structuring module configured to annotate or structure the document based on the reference text fragments and referenced object text fragments output by the reference identification and resolution module. 10. The document annotation or structuring system as set forth in claim 9 , wherein the selecting is subject to the further constraint that object text fragments selected for pairing with reference profiles of a same object type indicator be ordered in the document by their reference number.