13. A processing system configured to create a cross-index for a set of documents, the processing system comprising: a memory device configured to store the set of documents, a threshold score, and a verbosity setting; a processing device; a bus operably coupling the processing device to the memory; the processing device configured to: access the memory to read at least a sequence of words from a document in the set of documents; determine a respective score for at least a subset of words in the sequence based at least in part on word length; determine a number of the at least a subset of words in the sequence that have a score greater than or equal to a threshold score; determine whether the sequence of words contains a number of words that satisfies a verbosity setting; determine that the sequence of words is a significant phrase in response to determining that the number of the at least a subset of words in the sequence that have a score greater than or equal to the threshold score equals or exceeds a predetermined number and determining that the number of words in the sequence satisfies the verbosity setting; and add the significant phrase to a cross-index for the set of documents in response to determining that the significant phrase has been found in more than one document in the set of documents.
13. A processing system configured to create a cross-index for a set of documents, the processing system comprising: a memory device configured to store the set of documents, a threshold score, and a verbosity setting; a processing device; a bus operably coupling the processing device to the memory; the processing device configured to: access the memory to read at least a sequence of words from a document in the set of documents; determine a respective score for at least a subset of words in the sequence based at least in part on word length; determine a number of the at least a subset of words in the sequence that have a score greater than or equal to a threshold score; determine whether the sequence of words contains a number of words that satisfies a verbosity setting; determine that the sequence of words is a significant phrase in response to determining that the number of the at least a subset of words in the sequence that have a score greater than or equal to the threshold score equals or exceeds a predetermined number and determining that the number of words in the sequence satisfies the verbosity setting; and add the significant phrase to a cross-index for the set of documents in response to determining that the significant phrase has been found in more than one document in the set of documents. 19. The processing system of claim 13 wherein the cross-index is language independent.