Summary

• An EMdF schema is made up of enumerations and object types.

• You write the EMdF schema of a database in a schema script. This is a sequence of MQL statements that create the enumerations and object types.

• Start the script by issuing CREATE DATABASE and USE DATABASE statements.

• Decide which object types and enumerations should be present, and which features the object types should have. Then write MQL statements to create those in the EMdF schema script.

• Object types can form hierarchies, and there can be multiple, overlapping hierarchies. However, the hierarcies are only implicit in the monds of the objects, not explicit.

• Meta-data can be represented orthogonally to the rest of the data, by making object types that represent the meta-data and then creating objects anywhere in the monad stream that contain the data.

• The text is stored as features on objects. Thus the objects give rise to the text.

• Enumerations are good for grouping named values.