= CLARIN European Demonstrator Case and Federated Search =

In two meetings (January 2010 at the Meertens Institute and [[Clarin Federated Search Demonstrator| May 2011 at the MPI for Psycholinguistics]]) of the so-called EDC (European Demonstrator Case) EU and national CLARIN partners have committed to creating a common federated content search infrastructure demonstrating the power of the emerging CLARIN infrastructure. The Dutch Search & Develop CLARIN NL subproject, that has the same ambitions, takes part in this effort and contributes with its four CLARIN NL centers in this infrastructure.

At the last EDC meeting a prototype was demonstrated that connected search engines from four prospective CLARIN centers with a [[http://lux17.mpi.nl/ds/fedsearch/ | simple UI]] allowing different corpora housed by the contributors to be selected for searching. At the meeting new contributors offered to participate: OTA, BAS, University of Tuebingen, IDS. Also new functional enhancements for the prototype were decided:
* implementation of a default keyword search mode (substring)
* integration with metadata search (CMDI)

The work is currently coordinated by: Daan Broeder (MPI for Psycholinguistics), Matej Durco (ICLTT), Marc Kemps-Snijders (Meertens Institute)

Following breaks down the work into individual issues: 

 [[EDC-Architecture]] :: tentative reference architecture
 [[FederatedSearch|FCS]]:: Federated Content Search is mainly about the unifying interface to be implemented by individual Content Providers on top of their corpus search systems and the [[FCS-Aggregator]] - the actual service accomplishing the distributed search.
 [[CDMDC]] :: ''Combined Distributed Metadata Content Search'' is a next step, that shall allow to restrict the content search based on Metadata.
 [[EDC-Workbench]] :: the web application (web user interface), that allows the user to interact with the FederatedSearch and other related components, with the core use case being a combined metadata and content query. There is already an external wiki-page about this topic ([http://www.vronk.net/wiki/index.php/EDC_Workbench vronk.net EDC-Workbench]). It is slightly outdated, but a good starting point. A separate page - [[Viewable]] - elaborates on the issue of data types, formats and corresponding viewers.
 [[EDC-Agenda]] :: To collect and discuss tasks and assignements

Following diagram shall give an overview of the wiki-pages to this topic and their linking (implying some kind of dependence-relationship). Dashed nodes stand for external resources, dashed edges for "less important" (back-)links.

[[Image(wiki_EDC_FCS_linking.png, 1000)]]