- Content - Generic name for Book or Periodical.
- Book - A Book with a Title, Author and ISBN.
- Periodical - A newspaper or magazine with a Title and many Editions.
- Edition - An edition of a Periodical with a Title, Date and Revision.
- Revision - Periodical Editions are often updated during the day. Each has a separate revision number.
- Organizational Member - A member of an organization (e.g. a school) on whose behalf a Sponsor with an authorized Bookshare account can dowload books.