Abstract: A uni-level description of computer information built using basic structures or a metamodel allows model, schema, and instance information to be represented explicitly for a variety of distinct model-based representation schemes or models. Exemplary distinct representation schemes include Extensible Markup Language (XML), Resource Description Framework (RDF), developed by the World Wide Consortium, Topic Maps, and a relational database model. The uni-level description is stored in a computer readable medium and is comprised of basic structures that are instantiated to describe various models or representation schemes of interest. In one implementation, the uni-level description is expressed using triples, loosely based on RDF in one implementation. The basic structures or metamodel of the uni-level description includes or provides a basic or generic set of abstractions for information representations that are characterized as including representation schemes, schema level data, and instance level data.