Provides classes and interfaces for browsing an OLAP schema.

Schemas have a hierarchical structure:

> - {@link org.olap4j.OlapConnection}
>   - {@link org.olap4j.metadata.Catalog}
>     - {@link org.olap4j.metadata.Schema}
>       - {@link org.olap4j.metadata.Cube}
>         - {@link org.olap4j.metadata.Dimension}
>           - {@link org.olap4j.metadata.Hierarchy}
>             - {@link org.olap4j.metadata.Level}
>               - {@link org.olap4j.metadata.Member}
>               - {@link org.olap4j.metadata.Property}
>         - {@link org.olap4j.metadata.NamedSet}
>       - Dimension (shared)