A computer system supports the access of documents formatted according to different schemas. A model includes a relationship for different schemas. The relationship specifies a particular data and, corresponding to the particular data and one of the different schemas, a reference to one or more ontological-elements(s). An ontological-element defines a semantic relationship between the particular data (as subject) and objects with regard to a semantic relationship in documents. An executable program can include instructions or queries to access the particular data in a one or more documents. To access the particular data in the document, the executable program can access the model to obtain the reference to the ontological-elements corresponding to the particular data and the various schema for the various documents can refer to ontological-elements corresponding to the particular semantic relationships among the data, the ontological-elements further specifying one or more objects corresponding to the particular data; and can access objects in the particular documents as specified by ontological-elements.