9.4 The Object Database Management Group (ODMG) Model and Object Definition Language (ODL)
The Object Database Management Group (ODMG) was a group of vendors that developed and published standards for OO databases and languages. It was founded in 1991 and published several standards, including the ODMG 3.0 standard, published in 1999, before disbanding in 2001. Its work has been taken over by the OMG. The ODMG established standards for the object data model, the Object Definition Language (ODL), the OQL, and language bindings for C++, Java, and Smalltalk. ODL is a standard language for describing schemas in OO terms, serving the same function that SQL Data Definition Language (DDL) serves. FIGURE 9.6 shows the ODL definition for the revised ...
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