cert(optional)Signifies the degree of certainty or precision associated with a feature.
Value conforms to data.CERTAINTY.
evidence(optional)Indicates the nature of the evidence supporting the reliability or accuracy of the
intervention or interpretation.
Allowed values are:
"internal" (There is evidence within the document to support the intervention.), "external" (There is evidence outside the document to support the intervention.), "conjecture" (The assertion has been made by the editor, cataloguer, or scholar on the basis of