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# File Entity Reference
## Fields
- `size` (integer, positive, non-zero): Size of file in bytes. Eg: 1048576.
- `md5` (string): MD5 hash in lower-case hex. Eg: "d41efcc592d1e40ac13905377399eb9b".
- `sha1` (string): SHA-1 hash in lower-case hex. Not technically required, but
the most-used of the hash fields and should always be included. Eg:
"f013d66c7f6817d08b7eb2a93e6d0440c1f3e7f8".
- `sha256`: SHA-256 hash in lower-case hex. Eg:
"a77e4c11a57f1d757fca5754a8f83b5d4ece49a2d28596889127c1a2f3f28832".
- `urls`: An array of "typed" URLs. Order is not meaningful, and may not be
preserved.
- `url` (string, required): Eg: "https://example.edu/~frau/prcding.pdf".
- `rel` (string, required): Eg: "webarchive".
- `mimetype` (string): Format of the file. If XML, specific schema can be
included after a `+`. Example: "application/pdf"
- `release_ids` (array of string identifiers): references to `release` entities
that this file represents a manifestation of. Note that a single file can
contain multiple release references (eg, a PDF containing a full issue with
many articles), and that a release will often have multiple files (differing
only by watermarks, or different digitizations of the same printed work, or
variant MIME/media types of the same published work).
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