Red Hat Web Application Framework 6.1 Manuel d'utilisateur télécharger pdf (Page 203)

Appendix D.

PDL Syntax

This chapter introduces the syntax for the Persistence Deﬁnition Language.

D.1. PDL Grammar

The following is an Extended Backus-Naur Form (EBNF) grammar that deﬁnes the current PDL

language. EBNF is a standard notation for formally deﬁning a language that extends BNF (they are

functionally equivalent -- EBNF simply introduces some elements for better readability).

In this grammar, items within angle braces

ITEM are terminals (tokens), while

those not within angle brackets are non-terminals. If you are unfamiliar with EBNF,

http://www.garshol.priv.no/download/text/bnf.html is a good starting point.

/** Top level constructs. */

file :=

model <SEMI>

( pdl_import <SEMI> )*

( object_type | association | data_operation )*

<EOF>

model := <MODEL> idpath

pdl_import := <IMPORT> idpath ( <DOT> <STAR> )?

object_type :=

( <VERSIONED> )?

( <QUERY> | <OBJECTTYPE> ) id

( ( <EXTENDS> type |

<CLASS> javaClass <ADAPTER> javaClass |

<RETURNS> <INT> <DOT> <DOT> ( id | <INT> ) ) )?

<LBRACE> ( statement )* <RBRACE>

association :=

<ASSOCIATION> <LBRACE> property <SEMI> property <SEMI>

( property <SEMI> )*

( option_block )?

( event )* <RBRACE>

data_operation :=

<DATA_OPERATION> id <LBRACE> ( option_block )? sql_block <RBRACE>

/** First level constructs. */

statement := ( simple_statement <SEMI> | compound_statement )

simple_statement :=

( property_stmt | object_key | reference_key |

unique_key | aggressive_load | join_stmt )

compound_statement := ( event | option_block )

/** Simple statements */

property_stmt := property

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Red Hat Web Application Framework 6.1 Manuel d'utilisateur Page 203