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The Samvera Community has developed metadata recommendations, including mapping recommendations for objects currently defining metadata using XML. Fedora 5.x does not require many ontologies [add page for required Fedora 5.x ontologies], and it is possible to include and use any ontology that exists, although it is recommended to use ontologies that are shown to be actively currently active and well-maintained for longevity purposes. The following are specific metadata recommendations from the Samvera Community that can be used in Fedora 5.x:
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It is possible to use metadata in XML format (or JSON or other file formats) alongside stored digital objects in Fedora 5.x but editing, management, and integration with access systems such as Hyrax will require that metadata is added and maintained as RDF properties.