Giuseppe:
Another approach is to use the attached file (must be added to your
DSpace source code - see the wiki for details) to OAI export in RDF. In
addition to DC metadata, each item includes DSpace community &
collection & thumbnail URLs. Then use the oai2rdf tool with
the 'rdf' transformer to convert to a format Longwell wants.
Thanks,
Richard
On Thu, 2007-01-11 at 10:28 +0100, [EMAIL PROTECTED] wrote:
> Hi!
>
> I’m trying OAI-PMH RDFizer with the final goal to export and manage
> dspace library contents in a SESAME repository. I successfully tried
> that by using both mods and oai_dc transformers stylesheets available
> in the oai2rdf distribution. These xsl however capture and render in
> rdf only the strict dspace item properties . I would capture the
> whole dspace data model including Community,Collections, etc. the
> dspace item is related to. The OAI-mets crosswalk feature in dspace
> allows metadata harvesting of the whole dspace data model, so a mets
> transformer xsl is necessary for rdf rendering. Unfortunately this is
> not available in the current OAI-PMH RDFizer distribution: does
> someone (perhaps Stefano Mazzocchi) wrote that for its personal use
> and could provide me with?
>
>
>
> Thanks,
>
>
>
> Giuseppe Bux
>
>
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/*
* RDFCrosswalk.java
*
* Version: $Revision: 1.7 $
*
* Date: $Date: 2005/04/20 14:22:34 $
*
* Copyright (c) 2002-2005, Hewlett-Packard Company and Massachusetts
* Institute of Technology. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* - Neither the name of the Hewlett-Packard Company nor the name of the
* Massachusetts Institute of Technology nor the names of their
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
* TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
* USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
*/
package org.dspace.app.oai;
import java.util.Properties;
import java.sql.SQLException;
import org.dspace.app.webui.util.UIUtil;
import org.dspace.content.DCValue;
import org.dspace.content.Item;
import org.dspace.content.Bitstream;
import org.dspace.content.Bundle;
import org.dspace.content.Collection;
import org.dspace.content.Community;
import org.dspace.core.Constants;
import org.dspace.core.ConfigurationManager;
import org.dspace.search.HarvestedItemInfo;
import ORG.oclc.oai.server.crosswalk.Crosswalk;
import ORG.oclc.oai.server.verb.CannotDisseminateFormatException;
/**
* An OAICat Crosswalk implementation that extracts
* DSpace items into typed RDF format.
*
* @author Richard Rodgers
* @version $Revision: 1.0 $
*/
public class RDFCrosswalk extends Crosswalk
{
// base URL for thumbnails
private String baseUrl = null;
// hostname for rdf URI
private String hostName = null;
public RDFCrosswalk(Properties properties)
{
super(
"http://www.openarchives.org/OAI/2.0/rdf/ http://www.openarchives.org/OAI/2.0/rdf.xsd";);
baseUrl = ConfigurationManager.getProperty("dspace.url");
hostName = ConfigurationManager.getProperty("dspace.hostname");
}
public boolean isAvailableFor(Object nativeItem)
{
// Only implemented for items so far
return (nativeItem instanceof HarvestedItemInfo);
}
public String createMetadata(Object nativeItem)
throws CannotDisseminateFormatException
{
HarvestedItemInfo itemInfo = (HarvestedItemInfo)nativeItem;
Item item = itemInfo.item;
// Get all the DC
DCValue[] allDC = item.getDC(Item.ANY, Item.ANY, Item.ANY);
StringBuffer metadata = new StringBuffer();
/*
metadata
.append(
"<oai_dc:dc xmlns:oai_dc=\"http://www.openarchives.org/OAI/2.0/oai_dc/\"; ")
.append("xmlns:dc=\"http://purl.org/dc/elements/1.1/\"; ")
.append(
"xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\"; ")
.append(
"xsi:schemaLocation=\"http://www.openarchives.org/OAI/2.0/oai_dc/ http://www.openarchives.org/OAI/2.0/oai_dc.xsd\";>");
*/
metadata
.append(
"<rdf:RDF xmlns:rdf=\"http://www.w3.org/1999/02/22-rdf-syntax-ns#\"; " )
.append("xmlns:ow=\"http://www.ontoweb.org/ontology/1#\"; " )
.append("xmlns:dc=\"http://purl.org/dc/elements/1.1/\"; " )
.append("xmlns:ds=\"http://dspace.org/ds/elements/1.0/\"; " )
.append(
"xsi:schemaLocation=\"http://www.w3.org/1999/02/22-rdf-syntax-ns# http://www.openarchives.org/OAI/2.0/rdf.xsd\";>");
// construct URI for item
metadata.append("<ow:Publication rdf:about=\"oai:")
.append(hostName)
.append(":")
.append(item.getHandle())
.append("\">");
for (int i = 0; i < allDC.length; i++)
{
if (screened(allDC[i]))
{
String element = allDC[i].element;
// contributor.author exposed as 'creator'
if (allDC[i].element.equals("contributor")
&& (allDC[i].qualifier != null)
&& allDC[i].qualifier.equals("author"))
{
element = "creator";
}
// Escape XML chars <, > and &
String value = allDC[i].value;
// First do &'s - need to be careful not to replace the
// & in "&" again!
int c = -1;
while ((c = value.indexOf("&", c + 1)) > -1)
{
value = value.substring(0, c) + "&"
+ value.substring(c + 1);
}
while ((c = value.indexOf("<")) > -1)
{
value = value.substring(0, c) + "<"
+ value.substring(c + 1);
}
while ((c = value.indexOf(">")) > -1)
{
value = value.substring(0, c) + ">"
+ value.substring(c + 1);
}
metadata.append("<dc:").append(element).append(">")
.append(value)
.append("</dc:").append(element).append(">");
}
}
// add extended info - repository, collection, communities, and thumbnail URLs
metadata.append("<ds:repository>")
.append(clean(ConfigurationManager.getProperty("dspace.name")))
.append("</ds:repository>");
Collection[] colls = null;
Community[] comms = null;
Bundle[] origBundles = null;
Bundle[] thumbBundles = null;
try
{
colls = item.getCollections();
comms = item.getCommunities();
origBundles = item.getBundles("ORIGINAL");
thumbBundles = item.getBundles("THUMBNAIL");
}
catch(SQLException sqlE)
{
;
}
// all parent communities map to DC source
for (int i = 0; i < comms.length; i++)
{
metadata.append("<ds:community>")
.append(clean(comms[i].getMetadata("name")))
.append("</ds:community>");
}
// as do collections
for (int j = 0; j < colls.length; j++)
{
metadata.append("<ds:collection>")
.append(clean(colls[j].getMetadata("name")))
.append("</ds:collection>");
}
if (origBundles.length > 0 && thumbBundles.length > 0)
{
Bitstream[] bitstreams = origBundles[0].getBitstreams();
// add a URL for each original that has a thumbnail
for (int j = 0; j < bitstreams.length; j++)
{
String tName = bitstreams[j].getName() + ".jpg";
Bitstream tb = thumbBundles[0].getBitstreamByName(tName);
if (tb != null)
{
String thumbUrl = null;
try
{
thumbUrl = baseUrl + "/retrieve/" + tb.getID() + "/" +
UIUtil.encodeBitstreamName(tb.getName(),
Constants.DEFAULT_ENCODING);
}
catch(Exception e)
{
}
metadata.append("<ds:thumbnail>")
.append(thumbUrl)
.append("</ds:thumbnail>");
}
}
}
metadata.append("</ow:Publication>");
metadata.append("</rdf:RDF>");
return metadata.toString();
}
/*
* Return strings that are clean character data for XML
*/
private String clean(String data)
{
return data.replaceAll("& ", "& " );
}
/*
* Exclude Item DC elements unsuitable for harvest
*/
private boolean screened(DCValue dcValue)
{
// description.providence
if (isQualified(dcValue, "description", "provenance"))
{
return false;
}
// format.extent
if (isQualified(dcValue, "format", "extent"))
{
return false;
}
// date.available is algorithmically identical to date.accessioned
// suppress one
if (isQualified(dcValue, "date", "accessioned"))
{
return false;
}
return true;
}
private boolean isQualified(DCValue dcValue, String elName, String qualName)
{
return (dcValue.element.equals(elName) &&
dcValue.qualifier != null &&
dcValue.qualifier.equals(qualName));
}
}
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