1. OAI Standards for Sheet Music Meeting March 28-29, 2002 Basic OAI Principals How They Apply to Sheet Music Presenter: Curtis Fornadley, Senior Programmer/Analyst UCLA Library curtisf@library.ucla.edu What are the large pieces? 1) Open Archives Initiative (OAI) 2) Sheet music metadata and discovery

2. Open Archives Initiative Protocol for Metadata Harvesting (OAI ) Background Protocol Version 1.0 released 2001-01-21 Protocol Version 1.1 (2001-07-02) is the current version Version 2.0 will be released in June 2002. Full Protocol: http://www.openarchives.org/OAI/openarchivesprotocol.htm Editors: Herbert Van de Sompel and Carl Lagoze Cornell University - Computer Science

3. The Goal of OAI: “to supply and promote an application-independent interoperability framework that can be used by a variety of communities who are engaged in publishing content on the Web.” The OAI protocol facilitates metadata harvesting.

4. OAI Requests and Responses OAI Requests may be expressed using either the HTTP GET or POST methods. OAI Responses are formatted as HTTP responses. Every OAI protocol request returns a Content-Type of text/XML. All OAI Responses are valid XML (i.e. valid to specified OAI XML schemas)

5. OAI Data and Service Providers There are two classes of participants: Data Providers: Administer systems that support the OAI protocol as a means of exposing metadata about the content in their systems. “Data Providers receive Requests and issue Responses” Service Providers (aka harvesters): Issue OAI protocol requests to the systems of data providers, and use the returned metadata as a basis for building value-added services. “Service Providers issue Requests and receive Responses”

6. OAI Sheet Music Data and Service Providers

7. Important OAI “Nouns” Repository - a network accessible server to which OAI protocol requests can be submitted. The OAI protocol provides access to metadata from OAI-compliant repositories. This metadata is output in the form of a record. Record - an XML-encoded byte stream that is returned by a repository in response to an OAI protocol request for metadata from an item in that repository. OAI records are organized into the following parts: header -- information that is common to all records. unique identifier - a key for extracting metadata date stamp -- the date of creation, deletion, or last update metadata -- a single manifestation of the metadata from an item. The OAI protocol supports multiple formats of metadata for any single item. At a minimum, repositories must be able to return records with metadata expressed in the Dublin Core format, without any qualification. Set - an optional construct for grouping items in a repository for the purpose of selective harvesting of records. Example: one set for “Public Domain” and another for “Copyright” sheet music

8. Important OAI “Verbs” The meat of the OAI is the six “verbs” used to harvest metadata. 1) GetRecord - to retrieve an individual record (metadata) from an item in a repository. Required arguments specify the identifier of the requested record and the format of the metadata that should be included in the record. 2) Identify - to retrieve information about a repository, including administrative, identity, and community-specific information. 3) ListIdentifiers - to retrieve the identifiers of records that can be harvested from a repository. Optional arguments permit selectivity of the identifiers - based on their membership in a specific Set in the repository or based on their modification, creation, or deletion within a specific date range. 4) ListMetadataFormats - to retrieve the metadata formats available from a repository. DC is the minimum requirement. For purposes of clarity, all metadata prefixes will be preceded by the string oai_ (for example, oai_dc). 5) ListRecords - to harvest records from a repository. Optional arguments permit selectivity of the harvesting - based on the membership of records in a specific Set in the repository or based on their modification, creation, or deletion within a specific date range. 6) ListSets - to retrieve the set structure in a repository.

9. Sheet Music OAI Data Providers Existing OAI Data Providers: Library of Congress http://memory.loc.gov/cgi-bin/oai?verb=ListIdentifiers&set=mussm UCLA Library http://digital.library.ucla.edu/oai/servlet/uclaoai.OaiServlet?verb=ListIdentifiers Each participating institution will be responsible for creating an OAI- compliant sheet music repository. Major hurdles to becoming a Data Provider: -Programming -Data Mapping

10. Live Demo of UCLA Sheet Music Data Provider http://digital.library.ucla.edu/oai/

11. Registered OAI Service Providers ServiceImplementer Description ArcOld Dominion University A federated search services based on metadata harvested from several OAI compliant repositories. citebaseSearchSouthampton University The citebase Search service provides users with the facility for searching across multiple archives DP9Old Dominion University DP9 is an open source gateway service that allows general search engines, like Google, to index OAI-compliant archives NCSTRLOld Dominion University University of Virginia Virginia Tech NCSTRL provides unified access to technical reports and eprints. Repository ExplorerVirginia Tech web-based tool to test repositories for compliancy with the Open Archives Initiative Protocol version 1.1 or version 1.0. Scirus concentrating on scientific content only and by searching both web and (often proprietary) databases. TORII International School for Advanced Studies, Trieste, Italy Unified access to various open archives (Physics and Computer Science). Given sufficient consensus, UCLA proposes to create The OAI Sheet Music Service Provider.

12. Proposed High Level Design of OAI Sheet Music Service Provider

13. Hypothetical User Interface

14. Useful Tools and Sites Full OAI Protocol Full Protocol http://www.openarchives.org/OAI/openarchivesprotocol.htm OAI Repository Explorer - useful for interactive exploration and validation of OAI repositories. http://oai.dlib.vt.edu/cgi-bin/Explorer/oai1.1/testoai Library of Congress OAI Sheet Music Data Provider http://memory.loc.gov/cgi-bin/oai?verb=XXX&set=mussm UCLA Library OAI Sheet Music Data Provider http://digital.library.ucla.edu/oai/servlet/uclaoai.OaiServlet?verb= XXX UCLA Library OAI Site http://digital.library.ucla.edu/oai/ Registered OAI Service Providers http://www.openarchives.org/service/listproviders.html