MODS is the native Islandora metadata schema, but it can be mapped to many other schemas.
Best practices for controlled vocabularies
LOD Implementations
Library of Congress Recommended Format Specifications 2014-2015 - Recommended Format Specifications are hierarchies of the physical and technical characteristics of creative formats, both analog and digital, which will best meet the needs of all concerned, maximizing the chances for survival and continued accessibility of creative content well into the future. *Includes suggested Metadata for each format.