| Attributes |  att.dimensions (@unit, @quantity, @extent, @atLeast, @atMost, @min, @max, @precision, @scope) | cert | (certainty) signifies the degree of certainty associated with the
	intervention or interpretation. |  | resp | (responsible party) indicates the agency responsible for the
	intervention or interpretation, for example an editor or transcriber.| Status  | Optional |  | Datatype  |  1–∞ occurrences of  separated by whitespace |  | Values  | A pointer to an element in the document header that is
      associated with a person asserted as responsible for some aspect
      of the text's creation, transcription, editing, or encoding. |  
  |  | evidence | indicates the nature of the evidence supporting the reliability or
  accuracy of the intervention or interpretation.| Status  | Optional |  | Datatype  |  |  | Suggested values include: | - internal
 - there is internal evidence to support the intervention.
 - external
 - there is external evidence to support the intervention.
 - conjecture
 - the 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 the
      sources which support the given reading.| 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. |  
  |  
  |