Github user osma commented on the pull request: https://github.com/apache/jena/pull/53#issuecomment-99096043 [copying from the email I sent to the dev list, apparently the bot didn't notice my message] Thanks a lot Chris, this was indeed very useful! So you're already doing synchronization in your ppd-index code and handling deletions in an appropriate, if somewhat brutal, way. That should make it easier to implement synchronization in the regular case, where quads correspond exactly to Lucene documents.
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