Explanation

Code 23 is used to indicate a publication contains promotional audio for other works, typically by the same author or in the same series.

This code is always set in a <ProductContentType> element for digital publications, since promotional content, by definition, is never an essential source of information.

Only for use in ONIX 3.0 or later.

Schema.org mapping

Note that there is no equivalent to this value in schema.org metadata as the access modes of the content do not take into account content that is not required to understand the publication.

Examples

Example 1 — Audiobook with information about other audiobooks 
…
<PrimaryContentType>01</PrimaryContentType>
<ProductContentType>23</ProductContentType>
…

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