There are EAD elements that the Beinecke does not commonly use and therefore do not appear in the Elements of Description list. An archivist might choose to describe a collection using an unlisted element. Archivists are encouraged to consult with their supervisors if unlisted elements are used frequently.
A note on flexibility:
This chapter serves to guide description at the Beinecke Library. While the library strives to maintain a consistent structure across finding aids, regardless of the depth of description, this chapter should serve as instruction and guidance that allows for flexibility and exceptions.