Properties shared by all addition types.
- Apple News Format 1.7+
The type of addition. For example, Link.
The number of text characters that will be highlighted as the link.
The starting character index for which the addition is meant. A range starts at
0 for the first character.
range is specified,
range is required.
This is an abstract definition. Do not use this object type directly; use only the objects that extend it like Link.