Universal classification – “one that applies the same approach and terminology across domains” (Szostak 2014, 161).

Universal classification – “should be considered the sum of a number of domain specific systems (birds, cars, countries, religions, sciences, etc.).” (Hjørland 2017 447). 

Universal classification – “… bibliographic classifications such as the Dewey Decimal Classification or the Universal Decimal Classification” (Smiraglia 2014a, 52).