Data Property: Urn
http://www.astro.umd.edu/~eshaya/astro-onto/owl/operation.owl#Urn
Property Characteristics (and other axioms)
- functional (Urn)
Domains
Ranges
- string
Usage
- MSubtract -> Urn value ("urn:archive.astro.umd.edu/java/subtract.exe" (string))