1. A computer system supporting the access of documents, wherein a document can be formatted according to one of a plurality of different schemas, wherein a schema specifies at least syntactic relationships, structure, and element and attribute names by which to interpret documents, comprising: (A) a model configured to include a relationship for at least two different schemas, wherein the relationship is configured to specify a particular data and, corresponding to the particular data and one of the different schemas, a reference to at least one ontological-element, wherein the at least one ontological-element defines a semantic relationship between the particular data as subject and objects in documents; and (B) a processor configured with an executable program, wherein the executable program includes instructions to access the particular data in a document, the document being formatted according to the one of the different schemas, wherein to access the particular data in the document, the executable program is configured to: access the model to obtain the reference to the at least one ontological-element corresponding to the particular data and the one of the different schemas, refer to the at least one ontological-element corresponding to the particular data, the at least one ontological-element further specifying the objects corresponding to the particular data, and access the objects in the particular document as specified by the at least one ontological-element.