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User Guide
The information contained in this section applies to IBM WebSphere Commerce Version 7.0.0.9 and Feautre Pack 8. The documentation also applies to all subsequent releases and modifications until otherwise indicated in new editions.
Developing
The topics in the Developing section describe tasks performed by an application developer.
Web services and WebSphere Commerce
A web service is an interface that describes a collection of operations that are accessible through the network by using standardized XML messaging.
Data service layer
The data service layer (DSL) provides an abstraction layer for data access that is independent of the physical schema.
Object-relational metadata
Object-relational metadata is an XML file that maps physical SDO Java classes to the database schema. The data service layer requires this object-relational metadata to translate between the physical Java classes and the WebSphere Commerce database schema.

Object-relational metadata

Object-relational metadata is an XML file that maps physical SDO Java classes to the database schema. The data service layer requires this object-relational metadata to translate between the physical Java classes and the WebSphere Commerce database schema.

Each service module has a set of object-relational metadata files that represent the database schema for the component. Metadata for custom tables is stored in WC_eardir\xml\config\servicemodulepackagename-ext\wc-object-relational-metadata.xml.

Object-relational metadata is used for two purposes:

Generation of the physical SDO classes representing the database tables.
To map between the data in the database and the physical SDO Java classes.

When you are extending the schema, the Data Service Layer Wizard generates the object-relational mapping metadata, based on the table names you choose.