People's Network Discovery Service pnds_dc XML Format

Introduction

The pnds_dc XML format is an XML format that supports the encoding of DC metadata descriptions conforming to the People's Network Discovery Service Dublin Core Application Profile (PNDS DCAP) [PNDSDCAP]. This document must be read in conjunction with that description of the application profile.

Each XML element with the qualified name pndsdc:description (where the prefix "pndscdc" is bound to the XML Namespace Name http://purl.org/mla/pnds/pndsdc/) corresponds to a single metadata description; each child XML element of that XML element corresponds to a statement about the resource which is the subject of the description.

• the property URI is represented as the qualified name of the XML element
• a value string should be encoded as the content of the XML element
• a value URI should be encoded as the value of the valueURI XML attribute
• an encoding scheme URI should be encoded as the value of the encSchemeURI XML attribute

Example metadata record in pnds_dc XML format

<?xml version="1.0"?>
<pndsdc:description
         xmlns:dc="http://purl.org/dc/elements/1.1/"
         xmlns:dcterms="http://purl.org/dc/terms/"
         xmlns:pndsterms="http://purl.org/mla/pnds/terms/"
         xmlns:pndsdc="http://purl.org/mla/pnds/pndsdc/"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://purl.org/mla/pnds/pndsdc/
                             http://www.ukoln.ac.uk/metadata/pns/pndsdcxml/2005-06-13/xmls/pndsdc.xsd"
>
    <dc:identifier encSchemeURI="http://purl.org/dc/terms/URI">http://example.org/my/docs/12345/</dc:identifier>
    <dc:title xml:lang="en">Everything you wanted to know about identity, but were afraid to ask</dc:title>
    <dc:description xml:lang="en">The article provides a summary of the 2003 White Paper on identity cards for the UK
    with a critique from the perspective of several national and international civil liberties organisations.</dc:description>
    <dc:subject>Identity cards</dc:subject>
    <dc:subject>Civil liberties</dc:subject>
    <dc:subject>Human rights</dc:subject>
    <dc:type encSchemeURI="http://purl.org/dc/terms/DCMIType" valueURI="http://purl.org/dc/dcmitype/Text">Text</dc:type>
    <dcterms:license valueURI="http://creativecommons.org/licenses/by-nc-nd/2.0/uk/" />
    <dcterms:rightsHolder>The National Campaign Against Identity Cards</dcterms:rightsHolder>
    <dcterms:spatial encSchemeURI="http://purl.org/dc/terms/TGN">World, Europe, United Kingdom</dcterms:spatial>
</pndsdc:description>

Available at http://www.ukoln.ac.uk/metadata/pns/pndsdcxml/2005-06-13/xml/ex0.xml [Validate using XSV]

XML Schemas

The primary XML Schema for the pnds_dc XML format is:

• pndsdc.xsd: http://www.ukoln.ac.uk/metadata/pns/pndsdcxml/2005-06-13/xmls/pndsdc.xsd (target XML Namespace Name http://purl.org/mla/pnds/pndsdc/)

That schema imports the following schemas:

• dc.xsd: http://www.ukoln.ac.uk/metadata/pns/pndsdcxml/2005-06-13/xmls/dc.xsd (target XML Namespace Name http://purl.org/dc/elements/1.1/)
• dcterms.xsd: http://www.ukoln.ac.uk/metadata/pns/pndsdcxml/2005-06-13/xmls/dcterms.xsd (target XML Namespace Name http://purl.org/dc/terms/)
• pndsterms.xsd: http://www.ukoln.ac.uk/metadata/pns/pndsdcxml/2005-06-13/xmls/pndsterms.xsd (target XML Namespace Name http://purl.org/mla/pnds/terms/)

Latest versions of the schemas are available from:

• http://www.ukoln.ac.uk/metadata/pns/pndsdcxml/xmls/pndsdc.xsd
• http://www.ukoln.ac.uk/metadata/pns/pndsdcxml/xmls/dc.xsd
• http://www.ukoln.ac.uk/metadata/pns/pndsdcxml/xmls/dcterms.xsd
• http://www.ukoln.ac.uk/metadata/pns/pndsdcxml/xmls/pndsterms.xsd

Note: implementers are advised to exercise caution in using this latter set of URIs in instance documents since changes to the schemas are not guaranteed to be backwards compatible. Recommended practice is to refer to a "date-stamped" version.

Using the pnds_dc XML format in OAI-PMH

Data providers using this XML format as a metadata format in the context of the Open Archives Initiative Protocol for Metadata Harvesting [OAIPMH] should use the following conventions:

• metadataPrefix = pnds_dc
• metadataNamespace = http://purl.org/mla/pnds/pndsdc/
• schema = http://www.ukoln.ac.uk/metadata/pns/pndsdcxml/2005-06-13/xmls/pndsdc.xsd

References

[DCMIAM]
DCMI Abstract Model
http://dublincore.org/documents/abstract-model/

[PNDSDCAP]
People's Network Discovery Service Dublin Core Application Profile (PNDS DCAP)
http://www.ukoln.ac.uk/metadata/pns/pndsdcap/

[OAIPMH]
The Open Archives Initiative Protocol for Metadata Harvesting. Protocol Version 2.0 of 2002-06-14
http://www.openarchives.org/OAI/openarchivesprotocol.html

Content by Pete Johnston of UKOLN.
Last updated on: 13-Jun-2005

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