att.rdgPart

att.rdgPart attributes for elements which mark the beginning or ending of a fragmentary manuscript or other witness. [12.1.5 Fragmentary Witnesses]
Moduletextcrit — 12 Critical Apparatus
Memberswit witStart witEnd lacunaStart lacunaEnd
AttributesAttributes
wit(witness or witnesses) contains a list of one or more sigla indicating the witnesses which begin or end at this point.
Status Optional
Datatype 1–∞ occurrences of 

<rng:ref name="data.pointer"/>
data.pointer
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 element at the location pointed to, typically but not necessarily elsewhere in the same document.
Note
These elements may appear anywhere within the elements lem and rdg, and also within any of their constituent elements.