OpenEdge provides a Java class, com.progress.open4gl.ProDataGraphMetaData, that allows you to specify and access the schema (meta data) for a ProDataGraph object. Before you can instantiate a ProDataGraph object, you must first define its meta data. You can derive the meta data from an existing Java SDO DataGraph or specify the meta data directly using a ProDataGraphMetaData object. For more information on instantiating ProDataGraph objects, see ProDataGraph class.

The ProDataGraphMetaData must contain one or more ProDataObjectMetaData objects to specify the meta data for one or more temp-tables (ProDataObject collections) defined for the ProDataGraph (see ProDataObjectMetaData class).

If the ProDataGraph contains more than one ProDataObjectMetaData object, the ProDataGraphMetaData can also contain zero or more ProDataRelationMetaData objects. A ProDataRelationMetaData object defines a relationship between a parent and child ProDataObject collection (see ProDataRelationMetaData class).

The com.progress.open4gl.ProDataGraphMetaData class contains the following constructor and methods.