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Loads a new copy of the data model ontology, replacing the entire existing contents (if any) of its named graph. For more details about how the graph name and data model source are determined, see The Data Model Configuration Properties Guide.
When action=update, only load the ontology if the version of the current ontology is different from the version of the available one (also if there is nothing loaded yet). Note that it does not attempt to judge if the available version is later, just different.
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