DAML Resource Guide

Guide to Metadata for Science and Research 

Distributed Informational Retrieval for Science

RDF Transformations

RDF Query Facility

Semantic Web for  AURIS-MM project

Projects

Topics of interest:

Vocabularies

RDF Transformations

Sorry, in construction...

RDF To RDF Transformation

Current implementation Transformation: extended CWM (Common Warehouse Model). Step-by-step transformations, classes to classes mapping, properties to properties mapping, changing structure of data, mapping of domain values.

how to export/import you data

1. If transformation is multi-step operation, specify steps
2. For each step  specify
   1. which classes are mapped to each classes (possible not only 1-1 but m-n mapping, when several outcome objects are defined by several income objects) and conditions of class mappings
   2. which properties to which properties (and classes for complex transformation -  example, for each value of property author in data source create new object of class, condition - should be created only one object of class author for each unique lastname  + firstname in data source)
   3. specify domain mapping (vocabulary transformations or computable transformations   - example, map  ACM thesaurus to OSTAT (Austrian)) currently only defined database mapping (as in CWM) supported.
   4. specify which data from previous steps used and how (example - data driven transformation, number of loaded data or sum defines the next steps, or ID of newly created object can be used for referenceby other objects,  in new RDF database, reification. )
3. Specify how data transferred between steps
4. Specify error handling
5. Run

Graph transformations

Language to describe graph transformations

What is about semantic information?

RDF to relation and hierarchical models

Software

Links (RDF transformation , querying, ontology mapping integration  - still not classified, not complete list )

1. KAON - toolset from Karlsruhe University includes RDBMS to RDF transformation toolset (REVERSE).
2. RDF-QEL -> SQL Mapping (RDF Queries to SQL queries)
3. QL'98 - The Query Languages Workshop
4. Transformation Units - A Structuring Principle for Graph Transformation Systems.(Dr. Thesis. Sabine Kuske)
5. ICOM project tools for Intelligent Conceptual Modelling
6. RDF Transformations  - toolkit, ontology nased approach Vrije Universiteit  Division of Mathematics and Computer Science.
7. Ontology of Integration and Integration of Ontologies,Diego Calvanese, Giuseppe De Giacomo, and Maurizio Lenzerini,. 2001 Description Logic Workshop (DL 2001)", 
8. Querying and Transforming RDF  Stefan Kokkelink Transforming RDF with RDFPath
9. A Query Service for RDF, Stefan Decker (University of Karlsruhe), et all, QL 98
10. Bremer Semantic Translation project.
11. Stanford Scalable Knowledge Composition (SKC) project
12. Framework for ontology integration, Diego Calvanese, Giuseppe De Giacomo, Maurizio Lenzerini
13.   Description Logic Framework for Information Integration
14. Journal of Digital information, volume 1 issue 8
    Semantic Problems of Thesaurus Mapping
    Martin Doerr
    http://jodi.ecs.soton.ac.uk/Articles/v01/i08/Doerr/
15. Query + Metadata + Logic = Metalog, Massimo Marchiori, Janne Saarela, QL 98
16. Bernstein, P.A., A.Y. Levy, R.A. Pottinger, "A Vision for Management of Complex Models," Microsoft Research Technical Report MSR-TR-2000-53, June 2000, PDF, 179KB (short version in SIGMOD Record 29, 4 (Dec. '00)).
17. Sesame Query Language Definition On-To-Knowledge project deliverable 9, 2001
18. Querying Community Web Portals (PDF version) ICS-FORTH Technical report, 2000
19. Grrr Home Page  Graph Rewriting Programming Language
20. Graph Transformation Units And Modules - Aim
21. Graph Transformation Units with Interleaving Semantics
22. Transforming RDF with XSLT, Dan Connolly
23. Graph Transformation Modules and their Composition - Frank Drewes, et all
24. Hartmut Ehrig, Manfred Nagl, and Grzegorz Rozenberg, editors. Proc. Graph Grammars and Their Application to Computer Science, Lecture Notes in Computer Science 153, 1983.
25. Dactl: An experimental graph rewriting language
26. Using Graph Transformation Techniques for Integrating Information from the WWW
27. The HyperView Approach to the Integration of Semistructured Data, PDF format, Lucas C. Faulstich PhD disser., Prolog graph transformation rules, integration of semistructured data
28. APPLIGRAPH-Subgroup Meeting on Exchange Formats for Graph Transformation, September 5 - 6, 2000.

RDF - DB Integration toolkit

The objective of the project is to develop software toolkit which allows to integrate RDF data and relational databases.

The main type of toolkit operations:

1. Exporting RDF from RDBMS (with possible transformation in structure, vocabulary mapping)
2. transforming RDF
3. loading RDF into RDBMS (with possible transformation in structure, vocabulary mapping).

Database: relational database, ANSI SQL 92 compatible, JDBC  access.

RDF:  Jena API

Transformation: extended CWM (Common Warehouse Model). Step-by-step transformations, table to class mapping, column to attribute mapping, changing structure of data (RDF-DB extensions), mapping of domain values.

how to export/import you data

1. If transformation is multi-step operation, specify steps
2. For each step  specify
   1. which classes are mapped to each tables
   2. which properties to which columns (and tables for complex transformation)
   3. specify domain mapping (vocabulary transformations or computable transformations)
   4. specify which data from previous steps used and how (example - data driven transformation, number of loaded data or sum defines the next steps, or triggers running in database, define values for foreign key column referencing to main table  )
3. Specify how data transferred between steps (example, how to get column value created by database trigger or calculate sum of attribute, etс)
4. Specify error handling
5. Run

Implementation: Java 2

Simple demonstration of publishing data from CERIF into RDF  (without integration toolkit)