A Expression for querying against a CatalogServices Metadata
A query experession object is created for each unique query, populated with the query parameters and the SQL statement is obtained from it at the proper time.
A query expression is generated from {@link PersistenceFactory}, see this interface for information on how to configure it. The operators defined in this interface are part of SQL 92 and the supported OQL syntax and are expected to be supported by all query expressions. @author Assaf Arkin @version $Revision: 7121 $ $Date: 2005-03-05 06:42:06 -0700 (Sat, 05 Mar 2005) $
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