Introduction to RDF and RDFS Editor: MR€¦ · Introduction to RDF and RDFS Editor: MR3 Susumu...
Transcript of Introduction to RDF and RDFS Editor: MR€¦ · Introduction to RDF and RDFS Editor: MR3 Susumu...
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Introduction to
RDF and RDFS Editor: MR3
Susumu Tamagawa
OSM 2011, Lecture and Exercise, Web Intelligence
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Contents
• Overview of MR3
• Fundamental Concepts of RDF and RDFS
• Issues
• Detail of MR3
• Tutorial of MR3
• Exercises
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Overview of MR3
• Graphical RDF and RDFS editor
• MR3: Meta-Model Management based on
RDFs Revision Reflection
• Main feature
– Managing some relationships between RDF
and RDFS contents
• Place to obtain
– http://mr3.sourceforge.net/
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Fundamental Concepts of
RDF (Resource Description Framework)
• Resource
– an object, a “thing” we want to talk about
• Property
– a special kind of resources
– relations between resources
• Statement
– an object-attribute-value triple
• Literal
– an atomic value
– the object of an RDF statement (not the subject or the
predicate)
values
(resource or literal)
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An example of RDF statements
subject (Resource) predicate (Property) object (Literal)
hasFather
Statement
Model Person rdf:type
William object (Resource)
Charles
Syntax (XML) <rdf:Description about=“William”>
<hasFather>Charles</hasFather>
<rdf:type resource=“Person”/>
</rdf:Description>
Resource
Property
Literal
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Fundamental Concepts of
RDFS (RDF Vocabulary Description Language,
RDF Schema )
• Providing modeling primitives for expressing the
RDF model
• Class
– Defining groups of related resources
– Hierarchical relationships between classes
• rdfs:subClassOf property
• Property
– Defining the relationships between resources
– Hierarchical relationships between properties
• rdfs:subPropertyOf property
– Domain and range of a property
• rdfs:domain and rdfs:range property
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An example of RDFS statements
<rdf:Class rdf:about=“Person”>
<rdfs:subClassOf resource=“&rdfs;Resource”/> </rdf:Class>
<rdf:Property rdf:about=“hasFather”></rdf:Property>
Syntax (XML)
Model
hasFather rdf:Property rdf:type
Person
rdfs:Class rdf:type
rdfs:Resource rdfs:subClassOf
Class
Property Meta-Model
RDFS
= rdfs:domain
RDFS model and syntax are same as RDF
Note
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Issues
• High cost of building up RDF and RDFS
contents manually
• Conventional Tools
– Displaying XML based contents with RDF model
RDFS model
+
RDF model
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An example of RDF and RDFS
contents of academic domain
<?xml version="1.0"?>
<rdf:RDF
xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
xmlns:mr3="http://mmm.semanticweb.org/mr3#"
xmlns:owl="http://www.w3.org/2002/07/owl#"
xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#"
xml:base="http://mmm.semanticweb.org/mr3#">
<rdfs:Class rdf:about="#Academic Staff Member">
<rdfs:subClassOf>
<rdfs:Class rdf:about="#Staff Member"/>
</rdfs:subClassOf>
</rdfs:Class>
<rdfs:Class rdf:ID="Course"/>
<rdfs:Class rdf:ID="Professor">
<rdfs:subClassOf rdf:resource="#Academic Staff Member"/>
</rdfs:Class>
<rdfs:Class rdf:about="#Assistant Professor">
<rdfs:subClassOf rdf:resource="#Academic Staff Member"/>
</rdfs:Class>
<rdfs:Class rdf:about="#Associate Professor">
<rdfs:subClassOf rdf:resource="#Academic Staff Member"/>
</rdfs:Class>
<rdf:Property rdf:ID="isTaughtBy">
<rdfs:domain rdf:resource="#Course"/>
<rdfs:range rdf:resource="#Academic Staff Member"/>
</rdf:Property>
<mr3:Professor rdf:about="#Takahira Yamaguchi"/>
<mr3:Course rdf:about="#Web Intelligence">
<mr3:isTaughtBy rdf:resource="#Takahira Yamaguchi"/>
</mr3:Course>
</rdf:RDF>
•Web Intelligence is taught by Takahira Yamaguchi.
•Professor, Associate Professor, Assistant Professor,
Academic Staff Member, Staff Member, and
Course are classes
•All Professors, Associate Professors,
and Assistant Professors are Academic Staff Members
•All Academic Staff Members are Staff Members
•Courses must be taught by academic staff members only
convert into machine readable
English Statements
RDF/XML
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An example of RDF and RDFS
contents of academic domain
Web Intelligence Takahira Yamaguchi
isTaughtBy
Course Professor Associate
Professor
Assistant
Professor
Academic
Staff Member
Staff
Member rdfs:Class
isTaughtBy rdfs:domain
rdfs:range
rdfs:subClassOf rdfs:subClassOf
rdfs:subClassOf
rdfs:subClassOf
rdf:Property
rdf:type
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MR3
<rdf:RDF xmlns:rdfs=“…rdf-syntax-ns”>
<image rdf:about="http://...">
<title>…</title></image>…
</rdf:RDF>
<rdf:RDF xmlns:rdfs=“…rdf-schema#">
<rdfs:Class rdf:about="http://purl.org/rss/1.0..."
<rdf:Property rdf:about="http://purl.org/rss/1.0..."
</rdf:RDF>
Class Property
Property
RDFS Document
RDF Document
RDF Data Graph
RDFS Data Graph
(2)
(2) Graphical editing functions of RDFS contents
(1) Graphical editing functions of RDF contents
(1)
(3) RDF and RDFS model management facilities
(3)
Literal Resource
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RDFS model
rdfs:Resource
Course Professor
is-a
is-a Class
RDF model
isTaughtBy
Property
Web Intelligence Takahira Yamaguchi
Course Professor isTaughtBy
type of resources
RDF and RDFS model management facilities
(Overview)
Academic
Staff Member
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RDF and RDFS model management facilities
(Detail) • Manipulation of an RDFS Class
– Replace RDFS Class
– Removal of RDFS Class
• Manipulation of an RDFS Property
– Replace RDFS Property
– Removal of RDFS Property
• Replacing the Type of an RDF Resource
– Replace the RDFS class name with that referred to
before the use replaced the type of the RDF resource
– Create a new RDFS class that has yet to be defined
• Replacing the RDF Property
– Replace the RDFS property name with that referred to
before the user replaced the RDF property
– Create a new RDFS property that has yet to be defined
O->M
facilities
M->O
facilities
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RDF and RDFS model management facilities
(Example: Replace RDFS Class)
RDFS model
rdfs:Resource
Professor
is-a
is-a Class
isTaughtBy
Property
Takahira Yamaguchi
Professor isTaughtBy
Academic
Staff Member
Akito Sakurai
Professor isTaughtBy
Class Course
Class
Class
RDF model
Course
Course Web Intelligence
Machine Learning
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Tutorial of MR3
• How to install MR3
• Importing RDF and RDFS documents
• Mapping namespace and prefix
• Class Editor
– Inserting, Editing, Deleting, and Connecting is-a relationships
between classes
• Property Editor
– Inserting RDFS property and Defining domain and range of
RDFS property
• RDF Editor
– Inserting RDF literal and resource
• Exporting RDF and RDFS model
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How to install MR3
1. Install JRE
(Java Runtime Environment)
– http://www.oracle.com/techne
twork/java/javase/downloads/i
ndex.html
2. Download MR3_1_0RC5.zip
– http://sourceforge.net/projects
/mr3/files/MR_3/MR_3%201.
0%20RC5/
3. Unzip the download file and
execute run.bat
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Screenshot of MR3
Class Editor Property Editor
RDF Editor Attribute Dialog
Namespace Table
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Importing RDF and RDFS documents
OR
1 2
3
4
Other Serialization (N3, N-Triple, Turtle)
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After importing
example_academic_domain.rdf
Staff Member -> Staff_Member
Academic Staff Member -> Academic_Staff_Member
Associate Professor -> Associate_Professor
Web Intelligence -> Web_Intelligence
Takahira Yamaguchi -> Takahira_Yamaguchi
Space character is not supported in MR3.
Please replace space characters by underbars.
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Mapping namespace and prefix
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Class Editor
Inserting class
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Class Editor
Editing class
spell miss
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Class Editor
Removing class
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Class Editor
Connecting is-a relationships between classes
connect mode
drag & drop
move mode
Let’s insert exp:Assistant Professor class and
connect is-a relationships between Assistant Professor class and
Academic Staff Member class.
Excercise
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Property Editor
Inserting RDFS property
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Property Editor
Defining domain and range of RDFS property
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RDF Editor
Inserting RDF literal
Professor Takahira Yamaguchi's phone number is 045-566-1614.
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RDF Editor
Inserting RDF resource (1) Machine Learning Course is taught by Professor Akito Sakurai.
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RDF Editor
Inserting RDF resource (2) Machine Learning Course is taught by Professor Akito Sakurai.
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Exporting RDF and RDFS model
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Exercises 1. Convert the following English statements to an RDF and RDFS model.
– All trucks, vans, passenger vehicles are motor vehicles.
– All mini vans are passenger vehicles and vans.
– All Toyota Corollas are passenger vehiecles.
– Taro owns a toyota corolla.
– Taro is a person.
– Toyota motor corporation makes Toyota Corollas.
– Toyota motor corporation is a automobile company.
– Taro's vehicle registration number is xxxx-xxxx.
– Persons only have motor vehicles.
– Motor vehicles must be owned by persons only.
– Vehicle registration numbers must be owned by motor vehicles only.
– Motor vehicles must be made by automobile companies only.
2. Construct an RDFS ontology including a set of instances about your
interest (music, computer, sports, etc).
– Create at least 10 classes and at least 5 properties with domain and range classes
– Use at least 5 subClassOf statements.
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References
• http://people.csail.mit.edu/pcm/Hendler.pdf
• http://people.csail.mit.edu/pcm/Hawke.pdf
• A Semantic Web Primer, 2nd Edition
– ISBN-13: 978-0262012423
• http://mr3.sourceforge.net/