Explanation

Code 91 is used to indicate the assessment date (or last re-assesssment date) of a publication.

The date is provide in a <ProductFormFeatureDescription> element and must be of the form YYYYMMDD.

Only for use in ONIX 3.0 or later.

Examples

Example 1 — Assessment date 
<ProductFormFeature>
   <ProductFormFeatureType>09</ProductFormFeatureType>
   <ProductFormFeatureValue>91</ProductFormFeatureValue>
   <ProductFormFeatureDescription>
      20250820
   </ProductFormFeatureDescription>
</ProductFormFeature>

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