Content Access Protocols

Content Access Prototols

The pipes that make the sources work.

OAI-PMH###

See this overview.

• Attaching DC, RFC 1807 or MARC metadata
• A Java Harvester.
• A big list of repositories.
• http://arxiv.org/help/oa/index
• Summary of ResearchArchive at Victoria University of Wellington
• XML Schemas and Support for Multiple Record Formats in OAI-PMH

AtomPub

• AtomServer, AtomServer article, APL
• Apache Abdera APL
• Atomojo server & client NBSD
• atom-multipart
• Offical Atom link relationships.

Fedora

• Supports a range of APIs, some Fedora-specific, and OAI-PMH too.
• Stores and moves in FOXML

Others

• DB access, Amazon S3, DSpace, WebDav, CalDav, JCR, Atom, etc.
• Content Management Interoperability Services
• Google Data APIs (like Atom)
• Windows Live Data API

List, from http://discerning.com/topics/standards/resource_management.txt

• list(resource_path, query_expr, accept_mime_type) these kinds of formats
• HXDLG http://hdlg.sourceforge.net/ xmlns=http://www.hdlg.info/XML/filesystem
• manifest.xml xmlns=http://openoffice.org/2001/manifest
• atom:feed “application/rss+xml revision=http://purl.org/rss/1.0/”
• RMP (builtin)
• Web Collections http://www.w3.org/TR/NOTE-XMLsubmit
• OAI-PMH xmlns=”http://www.openarchives.org/OAI/2.0/static-repository”
• TODO: RDDL http://www.rddl.org/rddl2 (explain what namespaces mean) and http://www.w3.org/2001/tag/doc/nsDocuments/
• simply lists all metadata objects for all immediate children, in a XML response wrapper

  <collection xmlns="http://gupe.org/rmp" path="some/resource_path">
    <collection name="fred" ...>
      <atom:entry>...</atom:entry>
    </collection>
    <data name="fred/xml">
    </data>
  </collection>

Standards for Document Repositories

• The JISC Digital Repository Programme as part of its work is exploring the interaction between repositories and other systems.
• DSpace API Outline
• Multiple, so need a repository definition layer that defines:
  • Read method (HTTP hopefully).
  • Write method (HTTP too, on WebDAV etc, but we may need property definitions for different services).
  • Authentication system. Write, and probably reads need authentication with the repo.
• WebDAV plus standard metadata partner file (‘'’name’’‘.metadata.xml) would be fine for uploads.
• IDEA: Local wrapper allowing WebDAV access to selected local files/directories would be a nice way of allowing Planets access to arbitrary file resources. Even if just read-only access.