This property is read-only..

Specifies the prefix before an identifier letter. Any prefix can be chosen, but a number is most practical. For example, you receive a DT "4K5" with the digit "4" as the prefix. You also obtain this type of DT when you display the page number in the DT; in this case the DT changes when you change the page number. If you use a fixed prefix instead, then the DT does not change.

This property is used as part of a name. In order to set it, member NameParts must be used on object which name will be changed. Additionally for setting this property on a Page object, a function Page::SetName() or the Page constructor can be used.

Reference

MergedArticleReferencePropertyList Class
MergedArticleReferencePropertyList Members