Ontology based eReal Estate Agency Information System

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Ontology based e-Real Estate Agency Information
System
ByMoein Mehrolhasani 055230Bijan Zamanian
055156cmpe 588
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Outline

• What is our goal?
• Semnatic state Agency
• Implementation
• Queris
• Results
• Future Work

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What is our goal?

• Provide an ontology based information data base.
• For nonprofesional people to share their info in
  semantic world.
• For which who does not know any thing about
  ontology
• A simple system which can add ,remove,update and
  retriev information in an ontology based system

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• Gets inputs from user
• Runs queris based on inputs
• Return the result if there is any

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Implementation

• Protégé as ontology developer tool.
• RDQL as query language
• PHP as GUI developer
• Apache as a webserver

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Implementation (Cont. 1)

• Classes, Properties and attributs are defined in
  owl file.
• Owl File is transformed to rdfs file for
  simplicity o f running RDQL queries over it.
• A GUI is designed in PHP.
• Class_RDQL.php is included in t.php to perform
  query.
• Class_RDQL.php calls class_rdfparser.php

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Implementation (Cont. 2)

• Rdf file is parsed and queried using above
  mentioned classes.
• Parameters of GUI are sent to query.
• Query runs using above mentioned parameters.
• Results are reflected .

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The general form of an RDQL query

• SELECT variables listing
• FROM rdf documents
• WHERE patterns
• AND filter expressions
• USING prefix declaration

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SELECT

• Every successful query returns a set of variable
  bindings.
• SELECT clause defines a list of variables to be
  returned .
• Each variable is introduced by a question mark
  (?)
• SELECT ?name ?email, ?age,?tel_number

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FROM

• In the FROM clause we specify the path or URL of
  the
• RDF document to be queried

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WHERE

• Indicate a list of triple patterns which have to
  be
• matched by each valid query result set .
• (subject, predicate, object)
• WHERE (?resource, lthttp//www.w3.org/2001/vcard-rd
  f/3.0/EMAILgt,radol_at_gmx.de")

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AND

• We can specify expressions over values of
• URIs and literals.
• arithmetic conditions
• string equality expressions
• Perl-styl regula expressions

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USING

• A way to make the query
• easier to read
• write for humans
• shorten the length of URIs (used in the FROM,
  WHERE and AND clauses)
• WHERE (?resource, vCardEMAIL, "radol_at_gmx.de")
• USING vCard FOR lthttp//www.w3.org/2001/vcard-rdf/
  3.0/gt

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Results of a query
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Results of a query (Cont .1)
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Thank you for your attentions
?
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Refrences

• 1 http//phpxmlclasses.sourceforge.net/
• 2 http//jena.sourceforge.net/tutorial/RDQL
• 3 http//www.w3.org/Submission/RDQL
• 4 http//protege.stanford.edu/
• 5 http//www.php.net