In many cases it is important to understand the reasons why the Annotation was created, or why the Textual Body was included in the Annotation, not just the times and agents involved. These reasons are provided by declaring the motivation for the Annotation's creation or the purpose for the inclusion of the Body in the Annotation; the "why" rather than the "who" and "when" described in the previous sections.
Annotations do not currently have a 'motivation' property. For annotations, this should be 'commenting' (?), for replies this should be 'replying'