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In tests at UCL on the Java implementation of openEHR, retrieval of 1 openEHR Party object stored as fine-grained objects via Hibernate over MySQL and queried by primary key took seconds; retrieval of the same object stored in a "blob" form took a few milliseconds.
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Are openEHR data Versioned?
Yes. Versioning is a key part of the reference model. Its semantics are defined by the Common Information Model specification.
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