SIMPLE GENERATION OF RDF METADATA
MARTIN SVIHLA
svihlm1@fel.cvut.cz
Department of Computer Science and Engineering
Webing Research Group and Computer Graphics Group
Czech Technical University in Prague, Czech Republic
ABSTRACT
PROBLEM OVERVIEW
OUR PROPOSAL - TWO LAYER MAPPING
CONCLUSION
REFERENCES
SEMANTIC WEB
is an extension of
the current web…
The Semantic Web is an initiative that tries to add more structure and computer
understandable meaning to the data on the web. This extension of current web
should enable computers and people to work in better cooperation.
We propose our own concept of generating of Semantic Web content. RDF metadata
are generated directly from database, according to given ontology. Presented model
called METAmorphoses is two layer schema of mapping SQL to RDF, focused on
usability.
1. Berners-Lee, T., Hendler, J., Lassila, O.: The Semantic Web. Scientific American, May 2001
2. Resource Description Framework (RDF). March 2004, http://www.w3.org/RDF/
3. Handschuh, S., Staab, S., Volz, R.: On Deep Annotation. Proceedings of the 12th International
World Wide Web Conference, WWW 2003, ACM Press, 2003
...enabling better
COOPERATION
BETWEEN
COMPUTERS
AND PEOPLE.
Mapping layer






Mapping between SQL structure and ontology
Preserves consistency of generated RDF
Defines tags for template layer
Template layer
Mapping process (fig 2)












Used by Semantic web presentation programmer
Uses tags defined in mapping layer
Produces RDF instances according to mapping layer
Request for RDF is received, template is selected
Template calls mapping, that composes DBS query
Response is generated by template layer
z
Person
+Name
+Age
Project
+Name
+Type
+Homepage
Ontology
<person>
<hasName/>
<hasProject/>
</person>
SQL/RDF
Mapping
DATA RDF
1
2
3
4
Request
Response
Fig 1: SQL to RDF mapping
Template
layer
DATA
SQL/RDF
Mapping
layer
RDF
description
SQL
query
Result
set
Template
RDF
composition
Mapping
RDF
RDF
request
Fig 2: Two layer mapping
SQL to RDF mapping
Our presumptions












Automatic, fast, cheap and still up-to-date RDF data
Request for RDF translated to SQL query
Resultset translated to RDF and sent as response
Translation is based on mapping document
Data are stored in relational database
Metadata format is specified by ontology
(Fig 1)
Two layer mapping model is:








Suitable for data-intensive Semantic web presentations
Mapping layer preserves consistency of RDF according to ontology
Capable to capture any ontology
Programmer needn’t know ontologies
Reliable:
Flexible:
Simple programmer interface:
CVUT
Prague
Poster
Martin
Vanda
A
u
t
h
o
r
h
a
s
S
c
h
o
o
l
K
n
o
w
s
WorksIn
W
e
b
P
a
g
e
IsIn
Current web Semanti bc we
computers
semantic of information
understand
Technologies
Applications


























XML, URI, Namespaces
RDF, RDFS
Ontology - terms and relations
Logical framework - inference
Trust layer
knowledge management
information retrieval
adaptation
navigation
Enterprise App Integration
eCommerce (B2B, B2C)
webservices
intelligent agents