The File Use Vocabulary is a list of subclasses of pcdm:File that describe the role a pcdm:File plays within a pcdm:Object. These classes, combined with technical metadata (mime type, image resolution, etc.), should be used to determine which file to use in a given context.

File Use Values

Original File: the original file uploaded by the user
Thumbnail Image: low resolution placeholder image
Extracted Text: text extracted from documents/OCR
Preservation Master File: best quality file in a format appropriate for long-term preservation
Intermediate File: high quality representation of the Object, appropriate for generating derivatives or other additional processing
Service File: a format generated for serving to users, such as the PDF generated from a Word/LaTeX source file, MP3 generated from a WAV file, JPEG generated from a TIFF, etc.
Transcript: text representation that can be a substitute or complement for accessibility purposes, such as a transcript, subtitles, or closed captions

Examples

Object Type	Original File	Preservation Master File	Thumbnail Image	Extracted Text	Transcript	Service File
Audio	Logic source file	WAV	JPEG of album cover, promotional poster, etc.		transcript	MP3
Document	Word Doc	PDF	JPEG of first page	text dump		PDF
Image	Photoshop source file, uncropped/uncorrected TIFF	TIFF image	low-res JPEG	OCR text		med-res JPEG
Video	Premiere source file	full-quality MOV	JPEG of title frame	text-to-speech output	subtitles	720p MPEG4

Using Multiple Types

Multiple types may be appropriate for a single file, such as an image originally created as a medium-resolution JPEG. In that case, you can assign both Original File (because it's the original creation format) and Service File (because it's appropriate for serving to end users).

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