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3. Delta CAS capability will be built into the XMI serialization done in a service, and into the deserialization done on the client. Deserialization already supports merging new content into an existing CAS; a new deserialization option will enable or disable modifications of preexisting CAS content. Note that the XMI standard already includes add, delete and replace elements to be used in the delta CAS format.

The current XMI CAS serialization format is used to represent the Delta CAS serialzation with the addition of the following three attributes to the cas::View element:

1. added_members - list of XMI ids of feature structures newly indexed in this view.
2. deleted_members - list of XMI ids of feature structures delete from this view.
3. reindexed_members - list of XMI ids of feature structures that need to be reindexed as the feature values may have been modified.