Page History
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Makeup and Definition of AIPs
AIPs are Archival Information Packages
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- AIP is a package describing one archival objectobject in DSpace.
- The archival object may be a single Item, Collection, Community, or Site (Site AIPs contain site-wide information). Bitstreams are included in an Item's AIP.
- Each AIP is logically self-contained, can be restored without rest of the archive. (So you could restore a single Item, Collection or Community)
- Collection or Community AIPs do not include all child objects (e.g. Items in those Collections or Communities), as each AIP only describes one object. However, these container AIPs do contain references (links) to all child objects. These references can be used by DSpace to automatically restore all referenced AIPs when restoring a Collection or Community.
- AIPs are only generated for objects which are currently in the "in archive" state in DSpace. This means that in-progress, uncompleted submissions are not described in AIPs and cannot be restored after a disaster. Permanently removed objects will also no longer be exported as AIPs after their removal. However, withdrawn objects will continue to be exported as AIPs, since they are still considered under the "in archive" status.
- AIPs with identical contents will always have identical checksums. This provides a basic means of validating whether the contents within an AIP have changed. For example, if a Collection's AIP has the same checksum at two different points in time, it means that Collection has not changed during that time period.
- AIP profile favors completeness and accuracy rather than presenting the semantics of an object in a standard format. It conforms to the quirks of DSpace's internal object model rather than attempting to produce a universally understandable representation of the object. When possible, an AIP tries to use common standards to express objects.
- An AIP can serve as a DIP (Dissemination Information Package) or SIP (Submission Information Package), especially when transferring custody of objects to another DSpace implementation.
- In contrast to SIP or DIP, the AIP should include all available DSpace structural and administrative metadata, and basic provenance information. AIPs also describe some basic system level information (e.g. Groups and People).
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For more specific details of AIP format / structure, along with examples, please see DSpace AIP Format.
Running the Code
Exporting AIPs
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To export in single AIP mode (default), use this '"packager' " command template:
Code Block |
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[dspace]/bin/dspace packager -d -t AIP -e <eperson> -i <handle> <file-path> |
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It's worth understanding the primary differences between a Submission (specified by -s
parameter) and a Restore (specified by -r
parameter).
- Submission Mode (
-ss
mode) - creates a new object (AIP is treated like a SIP)- By default, a new Handle is always assigned
- However, you can force it to use the handle specified in the AIP by specifying
-o ignoreHandle=false
as one of your parameters
- However, you can force it to use the handle specified in the AIP by specifying
- By default, a new Parent object must be specified (using the
-pp
parameter). This is the location where the new object will be created.- However, you can force it to use the parent object specified in the AIP by specifying
-o ignoreParent=false
as one of your parameters
- However, you can force it to use the parent object specified in the AIP by specifying
- By default, will respect a Collection's Workflow process when you submit an Item to a Collection
- However, you can specifically skip any workflow approval processes by specifying
-w
parameter.
- However, you can specifically skip any workflow approval processes by specifying
- Always adds a new Deposit License to Items
- Always adds new DSpace System metadata to Items (includes new 'new "dc.date.accessioned'", '"dc.date.available'", '"dc.date.issued' " and '"dc.description.provenance' entries)" entries)
- WARNING: Submission mode may not be able to maintain Item Mappings between Collections. Because these mappings are recorded via the Collection Handles, mappings may be restored improperly if the Collection handle has changed when moving content from one DSpace instance to another.
- By default, a new Handle is always assigned
- Restore / Replace Mode (
-rr
mode) - restores a previously existing object (as if from a backup)- By default, the Handle specified in the AIP is restored
- However, for restores, you can force a new handle to be generated by specifying
-o ignoreHandle=true
as one of your parameters. (NOTE: Doesn't work for replace mode as the new object always retains the handle of the replaced object) Although a Restore/Replace does restore Handles, it will not necessarily restore the same internal IDs in your Database.
- However, for restores, you can force a new handle to be generated by specifying
- By default, the object is restored under the Parent specified in the AIP
- However, for restores, you can force it to restore under a different parent object by using the
-p
parameter. (NOTE: Doesn't work for replace mode, as the new object always retains the parent of the replaced object)
- However, for restores, you can force it to restore under a different parent object by using the
- Always skips any Collection workflow approval processes when restoring/replacing an Item in a Collection
- Never adds a new Deposit License to Items (rather it restores the previous deposit license, as long as it is stored in the AIP)
- Never adds new DSpace System metadata to Items (rather it just restores the metadata as specified in the AIP)
- By default, the Handle specified in the AIP is restored
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Warning | ||
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Please note: If you are submitting a larger amount of content (e.g. multiple Communities/Collections) to your DSpace, you may want to tell the 'packager' command to skip over any existing Collection approval workflows by using the
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Warning | ||
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When an Item is mapped to one or more Collections, this mapping is recorded in the AIP using the mapped Collection's handle. Unfortunately, since the submission mode (-s) assigns new handles to all objects in the hierarchy, this may mean that the mapped Collection's handle will have changed (or even that a different Collection will be available at the original mapped Collection's handle). DSpace does not have a way to uniquely identify Collections other than by handle, which means that item mappings are only able to be retained when the Collection handle is also retained.
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Warning | ||
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Please note, if you are using AIPs to move Please note, if you are using AIPs to move an entire Community or Collection from one DSpace to another, there is a known issue (see DS-1105) that the new DSpace instance will be unable to (re-)create any DSpace Groups or EPeople which are referenced by a Community or Collection AIP. The reason is that the Community or Collection AIP itself doesn't contain enough information to create those Groups or EPeople (rather that info is stored in the SITE AIP, for usage during Full Site Restores).
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Note | ||
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In some cases, when you restore a large amount of content to your DSpace, the internal database counts (called "sequences") may get out of sync with the Handles of the content you just restored. As a best practice, it is highly recommended to always re-run the "update-sequences.sql" script on your DSpace database after a larger scale restore. This database script should be run while DSpace is stopped (you may either stop Tomcat or just the DSpace webapps). PostgreSQL/Oracle must be running. The script can be found in the following locations for PostgreSQL and Oracle, respectively: |
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Note | ||
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In some cases, when you restore a large amount of content to your DSpace, the internal database counts (called "sequences") may get out of sync with the Handles of the content you just restored. As a best practice, it is highly recommended to always re-run the "update-sequences.sql" script on your DSpace database after a larger scale restore. This database script can should be run while the system DSpace is online (i.e. no need to stopped (you may either stop Tomcat or PostgreSQL)just the DSpace webapps). PostgreSQL/Oracle must be running. The script can be found in the following locations for PostgreSQL and Oracle, respectively: |
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Option | Ingest or Export | Default Value | Description |
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| ingest-only | true | Tells the AIP ingester to automatically create any metadata fields which are found to be missing from the DSpace Metadata Registry. When 'true', this means as each AIP is ingested, new fields may be added to the DSpace Metadata Registry if they don't already exist. When 'false', an AIP ingest will fail if it encounters a metadata field that doesn't exist in the DSpace Metadata Registry. (NOTE: This will not create missing DSpace Metadata Schemas. If a schema is found to be missing, the ingest will always fail.) |
| export-only | defaults to exporting all Bundles | This option can be used to limit the Bundles which are exported to AIPs for each DSpace Item. By default, all file Bundles will be exported into Item AIPs. You could use this option to limit the size of AIPs by only exporting certain Bundles. WARNING: any bundles not included in AIPs will obviously be unable to be restored. This option can be run in two ways:
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| ingest-only | Restore/Replace Mode defaults to 'false', | If 'true', the AIP ingester will ignore any Handle specified in the AIP itself, and instead create a new Handle during the ingest process (this is the default when running in Submit mode, using the |
| ingest-only | Restore/Replace Mode defaults to 'false', | If 'true', the AIP ingester will ignore any Parent object specified in the AIP itself, and instead ingest under a new Parent object (this is the default when running in Submit mode, using the |
| export-only | defaults to "all" | This option can be used to limit the Bundles which are exported to AIPs for each DSpace Item. By default, all file Bundles will be exported into Item AIPs. You could use this option to limit the size of AIPs by only exporting certain Bundles. WARNING: any bundles not included in AIPs will obviously be unable to be restored. This option expects a comma separated list of bundle names (e.g. "ORIGINAL,LICENSE,CC_LICENSE,METADATA"), or "all" if all bundles should be included. |
| both import and export | false | If 'true', the AIP Disseminator will export an AIP which only consists of the only import/export a METS Manifest XML file (i.e. result will be a single an unzipped 'mets.xml' file), instead of a full AIP. This METS Manifest contains URI references to all content files, but does not contain any content files. This option is experimental , and and is meant for debugging purposes only. It should never be set to 'true' if you want to be able to restore content files. Again, please note that when you use this option, the final result will be an XML file, NOT the normal ZIP-based AIP format. |
| export-only | false | If 'true' (and the 'DSPACE-ROLES' crosswalk is enabled, see #AIP Metadata Dissemination Configurations), then the AIP Disseminator will export user password hashes (i.e. encrypted passwords) into Site AIP's METS Manifest. This would allow you to restore user's passwords from Site AIP. If 'false', then user password hashes are not stored in Site AIP, and passwords cannot be restored at a later time. |
| import-only | false | If 'true', ingestion will skip over any "Could not find a parent DSpaceObject" errors that are encountered during the ingestion process (Note: those errors will still be logged as "warning" messages in your DSpace log file). If you are performing a full site restore (or a restore of a larger Community/Collection hierarchy), you may encounter these errors if you have a larger number of Item mappings between Collections (i.e. Items which are mapped into several collections at once). When you are performing a recursive ingest, skipping these errors should not cause any problems. Once the missing parent object is ingested it will automatically restore the Item mapping that caused the error. For more information on this "Could not find a parent DSpaceObject" error see Common Issues or Error Messages. |
| export-only | unspecified | If 'skip', the AIP Disseminator will skip over any unauthorized Bundle or Bitstream encountered (i.e. it will not be added to the AIP). If 'zero', the AIP Disseminator will add a Zero-length "placeholder" file to the AIP when it encounters an unauthorized Bitstream. If unspecified (the default value), the AIP Disseminator will throw an error if an unauthorized Bundle or Bitstream is encountered. |
| export-only | unspecified | This option works as a basic form of "incremental backup". This option requires that an ISO-8601 date is specified. When specified, the AIP Disseminator will only export Item AIPs which have a last-modified date after the specified ISO-8601 date. This option has no affect on the export of Site, Community or Collection AIPs as DSpace does not record a last-modified date for Sites, Communities or Collections. For example, when this option is specified during a full-site export, the AIP Disseminator will export the Site AIP, all Community AIPs, all Collection AIPs, and only Item AIPs modified after that date and time. |
| both import and export | Export defaults to 'true', | If 'true', every METS file in AIP will be validated before ingesting or exporting. By default, DSpace will validate everything on export, but will skip validation during import. Validation on export will ensure that all exported AIPs properly conform to the METS profile (and will throw errors if any do not). Validation on import will ensure every METS file in every AIP is first validated before importing into DSpace (this will cause the ingestion processing to take longer, but tips on speeding it up can be found in the "AIP Configurations To Improve Ingestion Speed while Validating" section below). DSpace recommends minimally validating AIPs on export. Ideally, you should validate both on export and import, but import validation is disabled by default in order to increase the speed of AIP restores. |
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Code Block |
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[dspace]/bin/dspace packager -r -a -t AIP -o [option1-]=[value] -o [option2-]=[value] -e admin@myu.edu aip4567.zip |
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