I apologize up front that this is a RANT.

I catalogue the non-fiction DVDs for my library. As a result I come across a lot of copy.
What I see all too often is the use of the following two genre headings in the same record !
655 7 $aNon-fiction films.$2lcsh
655 7 $aFeature films.$2lcsh
These are direct opposites! The non-fiction film is NOT a feature film, rather it is a non-feature.
The LC scope note for Nonfiction films reads:
term stands in opposition to fiction or fiction film and serves to group together all films which are meant to be educational or informational; used for films of a documentary nature and for films which have scientific, industrial, or pratical use; another term is factual film, which in its most restrictive sense only deals with the presentation of facts)
Our library has chosen to use other genre terms for these nonfiction films. Some of the terms we use are:
655 7 $aDocumentary films.$2lcsh
655 7 $aInstructional videos.$2lcsh
655 7 $aEducational videos.$2lcsh
655 7 $aExercise videos.$2local
We have chosen not to use the Non-fiction films heading.
The Wikipedia definition of a feature film is as follows: a feature film is a film made for initial distribution in theaters and being the “main attraction” of the screening. I think the use of feature films for non-fiction films is confusing for the patrons. That is like saying a non-fiction book is a novel if it is over 500 pages. Just wrong!