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Conceptual Model (CM): A conceptual representation of a modeled world,
i.e., an abstraction of the objects of a concrete application and
their properties and relationships. CMs typically capture the class
and object structure as well as domain-specifc relationships of the
modeled world. CMs can be expressed, e.g., as Entity-Relationship (ER)
diagrams, or as class diagrams in the Unified Modeling Language (UML).
Formal approaches and representations of CMs are often based on
(first-order predicate) logic.


Domain Map (DM): A kind of ontology used in model-based mediation (see
Chapter 6) to denote semantic networks of terms and their
relationships. A precise meaning can be associated to DMs via a logic
formalization, e.g., in a description logic. DMs are typically used to
express terminological knowledge.

Process Map (PM): A kind of ontology used in model-based mediation
(Chapter 6) to describe semantic networks of "procedural knowledge",
i.e., the processes of a domain and how they influence and depend on
each other. (see also: Domain Maps)

Model-Based Mediation (MBM): A wrapper/mediator approach and
architecture for information integration in which representations of
domain semantics (Domain Maps, Process Maps, and Semantic Integrity
Constraints) are used to faciliate queries across sources.

Semantic Mediation: synonym (Chapter 6) for Model-Based Mediation

One-World/Multiple-World Scenarios (Chapter 6): By "world" we mean a
coherent fragment of an application domain, i.e., classes of objects
and their relationships, that (i) "naturally belong together" and form
a coherent domain, and where (ii) the relationships among the objects
and classes is evident. Thus, a one-world mediation scenario can be
solved without additional "cross-world knowledge", while a
multiple-world scenario often requires specialized knowledge to bridge
the semantic gaps between worlds.