1. A computer usable program product comprising a computer usable storage device including computer usable code for disambiguation of dependent referring expression in natural language processing, the computer usable code comprising: computer usable code for selecting a portion of a document in a set of documents, the portion including a set of dependent referring expression instances; computer usable code for filtering the portion to identify an instance from a set of dependent referring expression instances by using a linguistic characteristic of the instance, the instance of dependent referring expression referring to a full expression, the full expression occurring in another document in the set of documents; computer usable code for locating the full expression in one member document in the set of documents by locating where the dependent referring expression is defined to be a stand-in for the full expression; and computer usable code for resolving, using a processor and a memory, the instance using the full expression such that information about the full expression is available at a location of the instance, wherein the computer usable code for resolving comprises: computer usable code for modifying the instance by adding data at a location of the instance, such that the data makes the information about the full expression accessible from the location of the instance; computer usable code for modifying the document to produce a second document, wherein the second document includes a mapping between the instance and the full expression in a metadata section of the second document, the metadata section being distinct from a location of the instance; and computer usable code for linking the instance to the mapping using a link, wherein the link is usable to make the information about the full expression accessible from the location of the instance.