Controlled Vocabulary for Audiovisual Core Content Description: List of Terms

Title

Controlled Vocabulary for Audiovisual Core Content Description: List of Terms

Namespace IRI

http://rs.tdwg.org/accd/values/

Preferred namespace abbreviation

accd:

Date version issued

2026-01-23

Date created

2026-01-23

Part of TDWG Standard

http://www.tdwg.org/standards/638

This version

http://rs.tdwg.org/ac/doc/cd/2026-01-23

Latest version

http://rs.tdwg.org/ac/doc/cd/

Abstract

Audiovisual Core uses the terms Iptc4xmpExt:CVterm and ac:CVtermLiteral to provide information about the content of all or part of a media item. This controlled vocabulary provides values for those terms.

Contributors

Steven J Baskauf (Vanderbilt University Heard Libraries), Edward Baker (Natural History Museum, London), Dan Stowell (Queen Mary University of London), Niels Klazenga (Royal Botanic Gardens Victoria)

Creator

TDWG Audiovisual Core Maintenance Group

Bibliographic citation

TDWG Audiovisual Core Maintenance Group. 2026. Controlled Vocabulary for Audiovisual Core Content Description: List of Terms. Biodiversity Information Standards (TDWG). http://rs.tdwg.org/ac/doc/cd/2026-01-23

1 Introduction (informative)

This document includes terms intended to be used as controlled values for Audiovisual Core terms Iptc4xmpExt:CVterm and ac:CVtermLiteral.

1.1 Status of the content of this document

Section 1 is informative (non-normative).

Section 2 is normative.

Section 3 is informative (non-normative).

In Section 4, the values of the Term IRI, Definition, and Controlled value are normative. The value of Usage (if it exists for a given term) is normative. The values of Term Name are non-normative, although one can expect that the namespace abbreviation prefix is one commonly used for the term namespace. Label and the values of all other properties are non-normative.

1.2 RFC 2119 key words

The key words “MUST”, “MUST NOT”, “REQUIRED”, “SHALL”, “SHALL NOT”, “SHOULD”, “SHOULD NOT”, “RECOMMENDED”, “MAY”, and “OPTIONAL” in this document are to be interpreted as described in BCP 14 [RFC 2119] and [RFC 8174] when, and only when, they appear in all capitals, as shown here.

2 Use of Terms

2.1 Relationship of value types to property terms

In accordance with the Audiovisual Core Term List document, unabbreviated term IRIs SHOULD be used as values of the property Iptc4xmpExt:CVterm. Controlled value strings SHOULD be used as values of the property ac:CVtermLiteral.

2.2 Relationship between values of ac:CVtermLiteral and Iptc4xmpExt:CVterm

An IRI for a term in this vocabulary denotes the same concept as the concept denoted by the controlled value string for the same term. Thus a client MAY infer an IRI value for Iptc4xmpExt:CVterm given a controlled value string for ac:CVtermLiteral even if that IRI is not explicitly stated. The practical implication is that data aggregators MAY materialize values for the preferred Iptc4xmpExt:CVterm property in cases where providers only provide values for ac:CVtermLiteral.

3 Term index

Barcode | Color Bar | Content Description Controlled Vocabulary | Context | Label | Organism Part | Packet | Scale Bar | Spoken Description

4 Vocabulary