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Data Definition Language. DDL is a type of database-specific syntax used to define the structuring of schemas. Common DDL statements include CREATE, DROP, and ALTER.

Link items define a specific relationship between two object types. Link instances relate one object to one or more different objects.

More on links in Data Model.

set reference

An identifier that represents a set of values. It can be the name of an object type or an expression alias (defined in a statement WITH block or in the schema via an alias declaration. or a qualified schema name).

simple path

A path which begins with a set reference.