If the <SpecificationFeatureType> requires free text rather than a controlled value, or if the code in <SpecificationFeatureValue> does not adequately specify the feature of the body, a short text description may be added. Optional, and repeatable to provide parallel descriptive text in multiple languages. The language attribute is optional for a single instance of <SpecificationFeatureDescription>, but must be included in each instance if <SpecificationFeatureDescription> is repeated.