Defines a multi-dimensional database. A Mondrian schema contains a logical model, consisting of cubes, hierarchies, and members, and a mapping of this model onto a physical model. The logical model consists of the constructs used to write queries in the MDX language: cubes, dimensions, hierarchies, levels, and members. The physical model is the source of the data presented through the logical model. It is typically a star schema, which is a set of tables in a relational databases.