Explanation

Code 51 is used to indicate that the publication can be read entirely by pre-recorded audio.

For a format like EPUB 3, this means that media overlay playback provides access to the full content of the publication.

Code 51 is equivalent to stating that a publication has a sufficient access mode of auditory.

Only for use in ONIX 3.0 or later.

Examples

Example 1 — Readable auditorily
<ProductFormFeature>
   <ProductFormFeatureType>09</ProductFormFeatureType>
   <ProductFormFeatureValue>51</ProductFormFeatureValue>
</ProductFormFeature>

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