SDO is based on the concept of disconnected data graphs. A data graph is a collection of tree-structured or graph-structured data objects. Under the disconnected data graphs architecture, a client retrieves a data graph from a data source, mutates the data graph, and can then apply the data graph changes back to the data source.
... from http://www-128.ibm.com/developerworks/library/specification/j-commonj-sdowmt/index.html ...
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