# Concepts

This section contains an overview of concepts you should be familiar with when using Dali to create mappings for Java persistent entities.

- Understanding Java persistence

- Understanding OR mappings

- Understanding EJB 3.0 Java Persistence API

In addition to these sections, you should review the following resources for additional information:

- Eclipse Dali project: `http://www.eclipse.org/webtools/dali`

- Eclipse Web Tools Platform project: `http://www.eclipse.org/webtools`

- JSR 220 EJB 3.0 specification: `http://www.jcp.org/en/jsr/detail?id=220`