Digital resources include items such as * digitized (i.e., scanned) books and articles
* born-digital texts
* audio files (e.g., wav, mp3)
* images (e.g., tiff, gif)
* movies (e.g., mp4, quicktime)
* datasets (e.g., downloadable statistics files)
These resources, often hidden from search engine users behind web scripts, are known as the "deep web." The owners of these resources share them with the world using OAI-PMH.
