An article is a written document within a magazine, may also an online article. Only a couple of pages. Blog posts may only be articles in this definition if they have passed some quality gate (typically provided by professional publishers).
A monograph of at least 49 pages (according to the UNESCO definition). A book may have different forms, but in this definition is required to be readable.
A file repository resource is used to store files as attachments without creating a dedicated ressource for these files. Repositories of this type are a simple replacement for a
A set of documented requirements to be satisfied by a product or service. Specifications in this category are typically published as technical standards by organisations.
Information that is part of a conference session. No video material is attached. It may contain the script from the talk, slides or notes from an attendee.
A white paper is an authoritative report or guide that informs readers concisely about a complex issue and presents the issuing body's philosophy on the matter.