Possible Illegible Characters/Lines

• TEI definition: gap ; EpiDoc-specific customization: gap
• TEI definition: certainty

Where vestiges of characters or lines possibly remain, but they cannot be recognised and their quantity is unknown, a gap should be used, and given a reason attribute with a value of "illegible" and an extent with a value of "unknown". To express uncertainty as to whether or not an illegible character or line is actually present, a <certainty> with a match corresponding to the parent element (i.e. the gap) should be given a locus with a value of "name".