Metadata Schema for CERIF-2000

Andrei LopatenkoVienna University of Technologyhttp://derpi.tuwien.ac.at/~andrei

What we have now SGML DTD to describe CERIF data (old

version of CERIF) SGML is used for data exchange

between national institutions and ERGO

SGML DTD is only for old version of CERIF (projects)

Strictly defined structure and semantic of elements

What we need

Metadata format to describe the CERIF-2000 data (with new entities, attributes)

Due to diversity of data descriptions in different countries, institutions it should be possible to extend schema with expressing meaning of new elements

Possible solution

Semantic Web – RDF (Resource Description Framework)

to encode data, DAML + OIL (DARPA Agent Markup

Language + Ontology Inference Layer) to express semantic of classes and attributes

Advantages

The direct way to Knowledge Management solution

The possible way to solve problems of different vocabularies, classifications. Ready to work in heterogeneous distributed environment

Easy to implement contrasting to KIF/KQML, Description Logic solutions

Advantages XML experience can be utilized for

development SW solutions XML compatibility makes solution close to

industry solutions Semantic richness of SW makes possible to

developed advanced information retrieval over SW encoded data

Already developed tools can be applied

Disadvantages

XML experience is not enough. Developed should be taught to SW

Not so powerful as complete Description Logic solutions

Not so efficient on huge volumes of data as traditional database technologies (replication)

DAML + OIL Allows to describe hierarchical relations

between classes of data Allows to specify classes (create

vocabulary!) of data using slot restrictionsExample: “Workshop” is “Event”“EU project” is a “Project”, which value of

attribute “funding organization” is an object of class “European Funding Organization”

DAML + OIL

Distributed ontologiesMy (AURIS-MM) project is a subClassOf

CERIF:Project. Tools for ontology checking

(Description Logics, CLOS based theory for DAML )

Tools for ontology development Tools for ontology visualization

DAML + OIL Advanced information retrieval solutions Implemented and tested Projects: EU Projects (On-To-Knowledge,

KA3:IAF ), DARPa project CAKE, WebScript, DAML Services, Knowledge Creation tools for DAML, ASCS, etc

See, www.cordis.lu, www.darpa.mil, www.daml.org, derpi.tuwien.ac.at/~andrei/DAML.htm

DAML + OIL Developed the first version of ontology http://derpi.tuwien.ac.at/~andrei/cerif-rdf-d

c-mn.daml Mapping (as a subclass relations and

axioms) to other well-known schemas (DublinCore and MathNet)

Tested for simple information retrieval operations (but including semantic information)

DAML + OIL example of schema<daml:Class

rdf:ID="http://derpi.tuwien.ac.at/~andrei/cerif-rdf-dc-mn.daml#CERIF.Workshop"><rdfs:label>CERIF.Workshop</rdfs:label>

  <rdfs:comment />   <oiled:creationDate>16:19:57

07.08.2001</oiled:creationDate> <rdfs:subClassOf>  <daml:Class

rdf:about="http://derpi.tuwien.ac.at/~andrei/cerif-rdf-dc-mn.daml#CERIF.Event" />

  </rdfs:subClassOf>

  </daml:Class>

DAML + OIL

Easy creation of custom vocabularies based on shared vocabularies

Easy specification of which classes (multiple classes possible) instantiate given object

DAML + OIL Example: Publications database: classes for researchers:

Dissertation, Conference article, Journal article, Journal with evaluations, Patent

Classes for university administration: Class A (score 2): International Patent, Class B (score 1): Journal Article in International

journal which is Journal with Evaluation

DAML + OIL

Created hierarchy of slots what makes information retrieval more clear and easy to implement

Example: full-text search operations based on “full-text description” slot (attribute)

project_abstract, project_title, project_desription are subslots of “full-text description”

If new slot added “project_last_year_summary” to include it nto full text search it would be enough tp specify it as a subslot of “full-text description”

DAML + OILExample of class hierarchy: from extended

CERIF

RDF

DAML + OIL specifies schema. Also possible to encode data (“instances”) in DAML

For EuroCRIS we propose use RDF as encoding format

RDF description should be consistent with DAML + OIL Schema

RDF Developed a toolset to export/import

data CERIF database <-> CERIF RDF Toolset to query CERIF RDF data (now

very simple information retrieval operation but distributed and with semantic)

Toolset to get data from CERIF RDF and put into Prolog knowledge base is beeing developed

Current work

RDF version of CERIF-2000. Knowledge Management solution for research but data store is RDF

New advanced information retrieval possibilities for CERIF

Proposal For testing try to use DAML + OIL and RDF

for data sharing and distributed retrieval operation between different EuroCRIS organization

Create and deploy advanced IR solution based on CERIF RDF and compatible with any CERIF database. Make it free and a par of CERIF implementation