Download PDF Home History |  | API Search Feedback FAQ

> ## Terminology

> The following list defines some of the terms referred to in this chapter.

> - Abstract schema: The part of an entity bean's deployment descriptor that defines the bean's persistent fields and relationships.
> - Abstract schema name: A logical name that is referenced in EJB QL queries. You specify an abstract schema name for each entity bean that uses container-managed persistence.
> - Abstract schema type: All EJB QL expressions evaluate to a type. If the expression is an abstract schema name, by default its type is the local interface of the entity bean for which the abstract schema name is defined.
> - Backus-Naur Form (BNF): A notation that describes the syntax of high-level languages. The syntax diagrams in this chapter are in BNF notation.
> - Navigation: The traversal of relationships in an EJB QL expression. The navigation operator is a period.
> - Path expression: An expression that navigates to a related entity bean.
> - Persistent field: A virtual field of an entity bean with container-managed persistence; it is stored in a database.
> - Relationship field: A virtual field of an entity bean with container-managed persistence; it identifies a related entity bean.

Download PDF Home History |  | API Search Feedback FAQ

All of the material in The J2EE(TM) 1.4 Tutorial is copyright-protected and may not be published in other works without express written permission from Sun Microsystems.