From NSDLWiki

hasResourceOTHER

The hasResourceOTHER property represents a non-URL identifier

Namespace 

http://ns.nsdl.org/api/relationships#

Prefix 

nsdl

Cardinality 

exactly one

Found in

Agent, Resource

Values 

any text

Usage and Semantics

deprecated. This was used to represent resources that do not have any digital representation. However, as their utility us limited, it may make sense to eliminate this identifier