234 Glossary JSP JavaServer Page text document
Glossary 235 ODBMS Object Database Management System a data store that natively persists objects ODMG Object Data Management Group OEM Original equipment manufacturer optional JDO features Features detailed in the JDO specification, but which an implementation is not obliged to support in order to be JDO-compliant O-R Object-Relational applies to any mechanism that maps between object technology and relational technology, and specifically to JDO implementations that support an underlying relational database orthogonal Concepts are orthogonal if they are independent of each other (the Greek actually means at right angles ); transactionality and persistence are orthogonal concepts, and thus an instance may be transactional or not transactional regardless of whether it is persistent or non-persistent persistence by reachability The recursive algorithm by which transient instances referenced by a persistent instance are themselves made persistent persistence-capable A class that implements the PersistenceCapable interface and which is identified to the implementation as such (as a persistence-capable class) in the persistence descriptor persistence descriptor An XML document that identifies the persistence- capable classes to a JDO implementation, and facilitates the overriding of default persistence modifiers and the specification of further persistence-relevant information for such classes persistent Stored beyond the lifetime of a single JVM process objects (and object graphs) which are persistent, represent data that is stored in the data store Persistent-Clean (JDO state) The state that applies to any JDO instance that has some of its field values loaded, but which has not been changed in the current transaction Persistent-Deleted (JDO state) The state that applies to any JDO instance that was persistent before this transaction, but has been deleted in the current transaction Persistent-Dirty (JDO state) The state that applies to any JDO instance that was persistent before this transaction, but has been changed in the current transaction Persistent-New (JDO state) The state that applies to any JDO instance that has been made persistent in the current transaction Persistent-New-Deleted (JDO state) The state that applies to any JDO
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