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NCore  is an open-source suite of tools and services for creating production digital libraries and related repository systems. It provides a general platform for building digital libraries united by a common data model and interoperable applications. NCore currently powers the National Science Digital Library (NSDL), which catalogs over 2.5 million resources from over 130 digital collection providers and thousands of web sites.

NCore consists of a central repository that uses [http://www.fedora-commons.info Fedora] as its underlying data store; a data model and a web services API that implements the model; a number of fundamental services, including two full-text search services, OAI-PMH aggregation and service; and a suite of end-user tools, including the NCS cataloging and metadata management tool, the Expert Voices blogging system, and a repository-integrated wiki.

A growing number of the components of NCore have been released on SourceForge under the Educational Community License (ECL 1.0), with plans to release the entire suite during the first half of 2008. See below for a list of and links to the released components.

=== Papers Describing NCore ===
The following papers describe various aspects of the NCore architecture, platform, and suite of tools and services, as well as the NSDL architecture that it evolved from.
* [http://arxiv.org/abs/0803.1500 NCore: Architecture and Implementation of a Flexible, Collaborative Digital Library]
* [http://arxiv.org/abs/cs.DL/0603024 Representing Contextualized Information in the NSDL]
* [http://www.dlib.org/dlib/november05/lagoze/11lagoze.html What is a digital library anymore, anyway?: beyond search and access in the NSDL]

=== Interoperability ===
[[Community:NCore/ToolsInteroperability/Design|Interoperability of NDR Collaborative Tools through Community Aggregations in the NDR]]

=== Released Components ===

* NSDL Data Repository (NDR) API
: [[Community:NDR|NDR Documentation]]
: [http://sourceforge.net/project/showfiles.php?group_id=204090 NDR API 1.1 Download] (Sourceforge)
: [http://nsdl-core.sourceforge.net/doc/javadoc/ NCore javadocs] (Sourceforge)

* NSDL Collection System (NCS)
: The NCS manages digital collections directly in the NSDL Data Repository (NDR)
: [[Community:NCS|NCS Documentation]]
: [http://www.dlese.org/downloads/dcs/v2.7.0/INSTALL_INSTRUCTIONS NCS Installation instructions]
: [http://sourceforge.net/project/showfiles.php?group_id=198325 NCS Software Download] (Sourceforge)

* Digital Discovery System (DDS)
: The DDS creates a local search index from collections in the NSDL Data Repository (NDR). DDS Web services may then be used to construct targeted thematic portals or other discovery-based applications.
: [http://www.dlese.org/dds/services/ddsws1-1/service_specification.jsp DDS Web service documentation]
: [http://www.dlese.org/downloads/dds/v3.3.10/INSTALL_INSTRUCTIONS.txt DDS Installation instructions]
: [http://sourceforge.net/project/showfiles.php?group_id=198325 DDS Software Download] (Sourceforge)

* Content Cache
: The Content Cache fetches, stores, and refreshes a specified set of web pages, for querying via a web service. NCore uses the Content Cache to enrich the search index, to produce "best-passage" results to search queries, and to provide liveness indicators for web pages. Uses the Nutch 0.9 fetching engine.
: [[Community:Search|ContentCache Documentation]]
: [http://sourceforge.net/project/showfiles.php?group_id=204090 Content Cache 1.0 download](SourceForge)

* NSDL Search Service
: Applications for building and maintaining a Lucene-based search index from the contents of the NSDL, and a web service for querying the index.
: [[Community:Search|Search Documentation]]
: [http://sourceforge.net/project/showfiles.php?group_id=204090 Search Service 1.0 beta download](SourceForge)

* Search Tools
: Utility classes and command-line tools for use with the Content Cache and the NSDL Search Service.
: [[Community:Search|Search Tools Documentation]]
: [http://sourceforge.net/project/showfiles.php?group_id=204090 Search Tools download](SourceForge)


=== NDR Collaborative Tools in development ===

There are currently three NSDL collaborative tools that have extensions developed to interact with the NSDL Data Repository:  OnRamp (Content management system), ExpertVoices (Blogosphere), and the NSDL Wiki.  These extension will be made available on sourceforge.org when available for release.

See [[Community:NCore/ToolsComparison|Choosing and using collaborative tools]]

* [http://onramp.nsdl.org NSDL OnRamp/OnFire]
: [[Community:OnFire|OnFire Documentation]]
: Beta version.

* [http://expertvoices.nsdl.org NSDL Expert Voices] 
: Plugins for [http://mu.wordpress.org WordPress MU]
: [[Community:ExpertVoices|ExpertVoices Documentation]]
: NSDL plugins Release 1.0 - [http://sourceforge.net/project/showfiles.php?group_id=204090&package_id=268145 Available on SourceForge]
: Currently running on WPMU 1.3.3

* [http://wiki.nsdl.org NSDL Wiki] 
: Extensions for [http://mediawiki.org MediaWiki]
: [[Community:NSDLWiki|NSDLWiki Documentation]]
: NSDL extensions Release 1.0 - [http://sourceforge.net/project/showfiles.php?group_id=204090&package_id=268147 Available on SourceForge]
: Currently running on MediaWiki 1.11



[[Category:NSDL_Community]] 
[[Category:Technology]]
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