Explanation

Code 53 is used to indicate that math content includes textual descriptions.

Descriptions are not restricted to images of math equations, but can accompany MathML markup or even plain text math presentations. Descriptions are an aid to help explain the visual rendering of an equation for persons who cannot perceive the equation in whole or part.

Only for use in ONIX 3.0 or later.

Examples

Example 1 — Described math equations 
<ProductFormFeature>
   <ProductFormFeatureType>09</ProductFormFeatureType>
   <ProductFormFeatureValue>53</ProductFormFeatureValue>
</ProductFormFeature>

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