Hi, I have a few questions about Jena's storage and query capabilities.
1. Jena seems to support RDF stores of these types: in-memory, SQL, native tuple store (TDB), and "custom." How are these stores initially populated, i.e., does Jena offer some kind of "load facility" that reads from, say, SQL and writes RDF? 2. If there is such a load facility, can it read from a NoSQL DB, e.g., MongoDB, and write to the RDF store? 3. Suppose that a SPARQL query needed to reference non-triplestore data. Can Jena call into a custom "adapter" that reads these non-triplestore data, receive these data from the adapter, and incorporate them into its query resolution? A more general question: what are some common practices concerning RDF store consistency? I suppose that most RDF stores are initially populated from SQL stores. Given the likely volatility of SQL stores, doesn't this mean that the RDF store can quickly grow stale, i.e., it might contain relationships among resources that no longer exist? How is this consistency issue handled in the real world? Thanks for your help. Cordially, Paul ________________________________ ATTENTION: ----- The information contained in this message (including any files transmitted with this message) may contain proprietary, trade secret or other confidential and/or legally privileged information. Any pricing information contained in this message or in any files transmitted with this message is always confidential and cannot be shared with any third parties without prior written approval from Syncsort. This message is intended to be read only by the individual or entity to whom it is addressed or by their designee. If the reader of this message is not the intended recipient, you are on notice that any use, disclosure, copying or distribution of this message, in any form, is strictly prohibited. If you have received this message in error, please immediately notify the sender and/or Syncsort and destroy all copies of this message in your possession, custody or control.
