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Gaurav Anand wrote about Daffodil (https://sourceforge.net/projects/daffodilreplica/).
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It looks like we might have a budding "data synchronization" category for this page:
http://incubator.apache.org/derby/papers/misc.html#Products+by+Type
While we're at it, has anyone on this list used Sync4J (an open source SyncML implementation)? The IBM developerWorks Java technology zone has an article that shows how to use it with derby and hsqldb:
http://www.ibm.com/developerworks/java/library/j-sync4j/
-jean
