Editing Object Data Management Group

The '''Object Data Management Group''' ('''ODMG''') was conceived in the summer of 1991 at a breakfast with [[object database]] vendors that was organized by Rick Cattell of [[Sun Microsystems]]. In 1998, the ODMG changed its name from the Object Database Management Group to reflect the expansion of its efforts to include specifications for both object database and [[object–relational mapping]] products.

The primary goal of the ODMG was to put forward a set of specifications that allowed a developer to write [[Software portability|portable]] applications for object database and object–relational mapping products.  In order to do that, the data schema, programming [[language binding]]s, and data manipulation and [[query language]]s needed to be portable.

Between 1993 and 2001, the ODMG published five revisions to its specification. The last revision was ODMG  version 3.0, after which the group disbanded.

== Major components of the ODMG 3.0 specification==
*''Object Model.'' This was based on the [[Object Management Group]]'s Object Model. The OMG core model was designed to be a common denominator for object request brokers, object database systems, object programming languages, etc. The ODMG designed a profile by adding components to the OMG core object model.
*''Object Specification Languages.'' The ODMG Object Definition Language (ODL) was used to define the object types that conform to the ODMG Object Model. The ODMG Object Interchange Format (OIF) was used to dump and load the current state to or from a file or set of files.
*''Object Query Language (OQL).'' The ODMG [[OQL]] was a declarative (nonprocedural) language for query and updating. It used [[SQL]] as a basis, where possible, though OQL supports more powerful object-oriented capabilities.
*''C++ Language Binding.'' This defined a [[C++]] binding of the ODMG ODL and a C++ Object Manipulation Language (OML). The C++ ODL was expressed as a library that provides classes and functions to implement the concepts defined in the ODMG Object Model. The C++ OML syntax and semantics are those of standard C++ in the context of the standard class library. The C++ binding also provided a mechanism to invoke OQL.
*''Smalltalk Language Binding.'' This defined the mapping between the ODMG ODL and [[Smalltalk]], which was based on the OMG Smalltalk binding for the OMG Interface Definition Language (IDL). The Smalltalk binding also provided a mechanism to invoke OQL.
*''Java Language Binding.'' This defined the binding between the ODMG ODL and the [[Java (programming language)|Java programming language]] as defined by the Java 2 Platform. The Java binding also provided a mechanism to invoke OQL.

== Status ==
ODMG 3.0 was published in book form in 2000.{{ref|odmgbook}} By 2001, most of the major object database and object-relational mapping vendors claimed conformance to the ODMG Java Language Binding. Compliance to the other components of the specification was mixed.{{ref|factbook}} In 2001, the ODMG Java Language Binding was submitted to the [[Java Community Process]] as a basis for the [[Java Data Objects]] specification. The ODMG member companies then decided to concentrate their efforts on the Java Data Objects specification. As a result, the ODMG disbanded in 2001.

In 2004, the [[Object Management Group]] (OMG) was granted the right to revise the ODMG 3.0 specification as an OMG specification by the copyright holder, Morgan Kaufmann Publishers. In February 2006, the OMG announced the formation of the Object Database Technology Working Group (ODBT WG) and plans to work on the [http://www.odbms.org/About/News/20060218.aspx 4th generation of an object database standard].

== ODMG Compliant DBMS ==
*Orient ODBMS: http://www.OrienTechnologies.com
*[[Objectivity/DB]] C++, Java and Smalltalk interfaces.

== References ==
#{{note|odmgbook}} ''The Object Data Standard: ODMG 3.0.'' Edited by R.G.G. Cattell and Douglas K. Barry, with contributions by Mark Berler, Jeff Eastman, David Jordan, [[Craig L. Russell (software architect)|Craig L. Russell]], Olaf Schadow, Torsten Stanienda, and Fernando Velez. Morgan Kaufmann Publishers, Inc., 2000. {{ISBN|1-55860-647-5}}.
#{{note|factbook}} ''Object Storage Fact Books: Object DBMSs and Object–Relational Mapping.'' Douglas K. Barry and Joshua Duhl. Barry & Associates, Inc., 2001. [http://www.barryandassociates.com/odmg-compliance.html Pages showing the ODMG compliance for both object database and object–relational mapping products in 2001.]

== External links ==
*ODMG: http://www.odbms.org/odmg-standard/ now part of ODBMS.org

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[[Category:Standards organizations in the United States]]
[[Category:Databases]]
[[Category:Object-oriented programming]]
[[Category:Organizations established in 1991]]
[[Category:1991 establishments in the United States]]