| type | classifies the addition, using any convenient typology. | 
|  | Datatype: CDATA | 
|  | Values: Any string of characters. | 
|  | Default: #IMPLIED | 
|  | Example: | 
| place | indicates where the addition is made. | 
|  | Datatype: CDATA | 
|  | Legal values: | | inline | addition is made in a space left in the witness by
an
earlier scribe. |  | supralinear | addition is made above the line. |  | infralinear | addition is made below the line. |  | marginleft | addition is made in left margin. |  | marginright | addition is made in right margin. |  | margintop | addition is made in top margin. |  | marginbot | addition is made in bottom margin. |  | overleaf | addition is made on the other side of the leaf. | 
 | 
|  | Default: #IMPLIED | 
|  | Example: Then they went back home.
<addSpan place='supralinear marginright overleaf' to=p23>
When they got there, ... | 
| Note | Long additions may frequently spill from one location to
another; in this case, more than one value may be given, as shown in
the example above. | 
| resp | (responsible) signifies the editor or transcriber responsible for identifying
the hand of the addition. | 
|  | Datatype: IDREF | 
|  | Values: must be one of the identifiers declared in the document
header, associated with a person asserted as responsible for some
aspect of the text's creation, transcription, editing or encoding
(see chapter 17  ). | 
|  | Default: %INHERITED | 
|  | Example: | 
| cert | (certainty) signifies the degree of certainty ascribed to the
identification of the hand of the addition. | 
|  | Datatype: CDATA | 
|  | Default: #IMPLIED | 
|  | Example: | 
| hand | signifies the hand of the agent which made the addition. | 
|  | Datatype: IDREF | 
|  | Values: must be one of the hand identifiers declared in the document
header (see section 18.2.1  ). | 
|  | Default: %INHERITED | 
|  | Example: | 
| to | identifies the endpoint of the added passage, by giving the ID
of an <anchor>  or other empty element placed there. | 
|  | Datatype: IDREF | 
|  | Values: any valid SGML identifier, used on a later element. | 
|  | Default: #REQUIRED | 
|  | Example: | 
| Note | Both the beginning and the end of the added material must
be marked; the beginning by the <addSpan>  element itself, the
end by the to  attribute. |