9. The system of claim 8 , where the comparison logic generates the differences document by merging the two or more state documents.
9. The system of claim 8 , where the comparison logic generates the differences document by merging the two or more state documents. 10. The system of claim 9 , including a data store to store state documents, and where state data describing a current state of a database object is stored in a state document in the database.