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Special Edition Using Enterprise JavaBeans™ 2.0 by Brian Keeton, Chuck Cavaness

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EJB QL Syntax in BNF Notation

The Backus Naur Form (BNF) developed by John Backus and Peter Naur (circa 1960) is the mechanism most often used to define the syntax of a programming language. Using a few meta-symbols, BNF allows the elements of a language to be defined recursively. There are alternate forms of these symbols, which can lead to some confusion if you’re not familiar with how to interpret them. To keep things simple, the notation presented in this section follows that used in the EJB 2.0 Specification for the most part. These symbols are defined in Table 8.2.

Table 8.2. BNF Symbols
Symbol Description
::= Read as “is defined as.”
<> Angle brackets surround elements that describe portions of the language but aren’t part of the actual ...

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