| Attributes | att.dimensions (@unit, @quantity, @extent, @precision, @scope)  (att.ranging (@atLeast, @atMost, @min, @max)) att.responsibility (@cert, @resp) 
    | evidence | indicates the nature of the evidence supporting the reliability or accuracy of the
        intervention or interpretation. | Status | Optional |  | Datatype | 1–∞ occurrences of separated by whitespace |  | Suggested values include: | internalthere is internal evidence to support the intervention.externalthere is external evidence to support the intervention.conjecturethe intervention or interpretation has been made by the editor, cataloguer, or
            scholar on the basis of their expertise.
 | 
 |  | source | contains a list of one or more pointers indicating sources
      supporting the given  intervention or interpretation. | Status | Mandatory when applicable |  | Datatype | 1–∞ occurrences of separated by whitespace |  | Values | A space-delimited series of sigla; each sigil should correspond to a witness or
        witness group and occur as the value of the xml:id attribute on a
        witness or msDesc element elsewhere in the document. | 
 |  |