Archive Accessor - Overview

The Archive Accessor is an OAI-PMH compliant front-end to the aDORe Archive through which XML-based representations of Digital Objects can be requested.

Each XMLtape is exposed as an autonomous OAI-PMH repository with the following characteristics (Protocol elements are shown in bold):

• It has a baseURL(XMLtape), which is an HTTP address that contains the XMLtape Identifier to ensure its uniqueness.
• Contained records are DIDL documents only.
• The identifier used by the OAI-PMH is the Package Identifier.
• The datestamp used by the OAI-PMH is the creation datetime of the DIDL document.
• Access based on identifier and datestamp is enabled via the aforementioned index created per XMLtape.
• The only supported metadata format is DIDL, with metadataPrefix DIDL, defined by the MPEG-21 DIDL XML Schema.
• The supported OAI-PMH harvesting granularity is seconds-level.

Identify the XMLtape:

http://host:port/adore-archive-accessor/biosis_2004_wk42_74cec16a-123a-11d9-b2ff-edcce387c576/Handler? 
      * verb=Identify

List all DIDL identifiers in the XMLtape

http://host:port/adore-archive-accessor/biosis_2004_wk42_74cec16a-123a-11d9-b2ff-edcce387c576/Handler? 
      * verb=ListIdentifiers &
      * metadataPrefix=didl

Obtain a DIDL with a specific identifier from the XMLtape

http://host:port/adore-archive-accessor/biosis_2004_wk42_74cec16a-123a-11d9-b2ff-edcce387c576/Handler? 
      * verb=GetRecord &
      * identifier = info:lanl-repo/i/7597dbe0-123a-11d9-9938-f5d3a54b430d
      * metadataPrefix=didl

Liu, X., Balakireva, L., Hochstenbach, P., Van de Sompel, H. (2005, June).
File-based storage of Digital Objects and constituent datastreams: XMLTapes and Internet Archive ARC files