Each Internet Archive item is comprised of several files. Many of these files are automatically generated and should not be either removed or modified.
IDENTIFIER_meta.xml is the definitive metadata file for the item. It is automatically generated at item creation time using the metadata provided either via headers or via files.
Please do not delete or modify this file. If you must modify the item's metadata, please either use the "Edit Item!" link at the top of its detail page or submit updated metadata via the IAS3 API. See the x-archive-ignore-preexisting-bucket header for additional information about updating an item's metadata via IAS3.
The item metadata in Dublin Core format.
Please do not delete or modify this file. If you must modify the item's metadata, please either use the "Edit Item!" link at the top of its detail page or submit updated metadata via the IAS3 API. See the x-archive-ignore-preexisting-bucket header for additional information about updating an item's metadata via IAS3.
IDENTIFIER_files.xml is an auto-generated file cataloging all of the files contained in the item. In addition to the filenames the IDENTIFIER_files.xml file will also list the file format and various hashes for each file. If the file is a derivative IDENTIFIER_files.xml will list the original file from which it was derived.
For example, here is an extract from the japanesefairytal00ozak_files.xml file for Japanese Fairy Tales:
<file name="japanesefairytal00ozak.epub" source="derivative">
<format>EPUB</format>
<original>japanesefairytal00ozak_abbyy.gz</original>
<mtime>1294020233</mtime>
<size>1230045</size>
<md5>1d87b3e04ca0b617e041bbcb0cd7f1a5</md5>
<crc32>7326f3ce</crc32>
<sha1>5434df04b1b811b03e7d9a32bde3119d3ca924c8</sha1>
</file>
Please do not delete or modify this file.
Whereas the x-archive-queue-derive header enables or disables queuing files for deriving for the entire item, it it possible to disable the creation of certain derive files using the IDENTIFIER_rules.conf file. There are three options for selecting which derivative formats to disable via IDENTIFIER_rules.conf:
You may disable creation of specific derivative formats by listing them–one format per line–in the IDENTIFIER_rules.conf file. The valid values for file formats can be found in the header rows of the derivatives chart.
For example, to disable creation of h.264 and Ogg Video derivative files, your IDENTIFIER_rules.conf file should contain the following:
h.264
Ogg Video
Some derivative file formats (mp3, ogg, ogv, mp4, webm) are considered "lossy" because they use a compression algorithm which produces a file which is not identical to the original. To prevent the creation of lossy derivatives, upload a IDENTIFIER_rules.conf file containing this line:
CAT.lossy
It is possible to disable creation of all derivative files using the IDENTIFIER_rules.conf file. This is equivalent to setting the x-archive-queue-derive header to a value of 0.
To disable all derivatives, upload a IDENTIFIER_rules.conf file containing this line:
CAT.all
A new or modified IDENTIFIER_rules.conf file will not be recognized until a new derive process is initiate for the item. It is currently not possible to initiate this process via the IAS3 API. To initiate the derive process in the Internet Archive interface:
- Login to Internet Archive
- Navigate to the item's page on Internet Archive
- Find the "Edit Item!" link in the upper right of the item
- Click the "change the information" link
- Click the "Item Manager" link near the top of the page
- Click the "derive" button
If now-excluded formats had previously been derived, initiating a derive process will remove the files from the item.
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