Star Trek Nebula Classification

"A nebula is an interstellar cloud of dust, gas, and plasma, where star formation usually occurs. In the year 2400, the Federation introduced a new system to classify nebulae. The new system first assigns the nebula a letter designation based upon its general composition. If the nebula has any unusual quirks, it is assigned an additional number designation. For example, a Class F2 Nebula is a Dark Nebula that contains disruptive electromagnetic radiation."

Star Trek Planetary Classification

"A planet is a celestial body in orbit around a star or stellar remnants, that has sufficient mass for self-gravity and is nearly spherical in shape. A planet must not share its orbital region with other bodies of significant size (except for its own satellites), and must be below the threshold for thermonuclear fusion of
deuterium. If a celestial body meets those requirements, it is considered a planet; at that point, the planet is further classified by its atmosphere and surface conditions into one of twenty-two categories."

Klassifikation für Musikbibliotheken

"Die Klassifikation ermöglich das Verzeichnen von Musikalien (grafische Musikaufzeichnungen, Musikdrucke, Noten, akustische Musikaufzeichnungen, Musiktonträger, Dateien). Facetten der Klassifikation können unter anderem folgende sein: bei der Aufnahme genutzte Stimmen und Musikinstrumente in standardisierter Abkürzung, Gattung, Genre, Form, Stilrichtung, geografischer Bezug, Anlass, Zweck, sozialer Träger, außermusikalischer inhaltlicher Bezug, zeitlicher Bezug Erscheinungsform, Spieldauer, Musikfarbe, Popularität, technisches Format)."

"The classification makes it possible to record music (graphical music recordings, music prints, notes, acoustic music recordings, musical instruments, files). Facets of the classification may include the following: voices and musical instruments used in the recording in standardized abbreviation, genre, genre, form, stylistic direction, geographic reference, occasion, purpose, social carrier, Popularity, technical format)."


"Nomisma.org is a collaborative project to provide stable digital representations of numismatic concepts according to the principles of Linked Open Data. These take the form of http URIs that also provide access to reusable information about those concepts, along with links to other resources."