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Protégé Ontology Library contains a set of OWL, Frame-based and other format ontologies. SchemaWeb is a directory of RDF schemata expressed in RDFS, OWL and DAML+OIL. The following are both directories and search engines. OBO Foundry is a suite of interoperable reference ontologies in biology and biomedicine.
The Pyramid of Sahure is a pyramid complex built in the late-26th to 25th century BC for the Egyptian pharaoh Sahure of the Fifth Dynasty.The main pyramid was built from roughly hewn limestone blocks bound with mud mortar and encased with fine white Tura limestone.