Semantic  Web  Assignment  3  Studentname:       Barry  Kollee  Student  number:     10349863  (UvA  studentNr)  Student  username:     bke310  (VU  username)  Assignment  name:     Semantic  web  Assignment  3    

Connecting  to  the  Web  of  Data  

1.  List  three  widely  used  ontologies  on  the  Web  of  Data  and  what  they  are  used  to  represent.  • DBpedia.  This  is  an  ontology  which  covers  all  the  exisiting  Wikipedia  pages.  So  it  mainly  can  

give  information  about  all  exisiting  Wikipedia  pages  or  parts  of  it.1  • FOAF  (Friend  Of  A  Friend).  This  is  a  dictionary  of  named  properties  and  classes  using  W3C’s  

RDF  technology.  2  • The  GeoNames  Ontology.  This  ontology  makes  it  possible  to  add  geospatial  semantic  

information  to  the  Word  Wide  Web.  3      2.  Name  three  formats  for  embedding  structured  data  into  HTML.  

• RDFa  Primer  • Microformats  • Microdata  

 3.  What  does  the  use  of  owl:sameAs  imply?    The  built-­‐in  OWL  property  owl:sameAs  inks  an  individual  to  an  individual.  Such  an  owl:sameAs  statement  indicates  that  two  URI  references  actually  refer  to  the  same  thing:  the  individuals  have  the  same  "identity".4    4.  How  can  you  connect  a  Semantic  Web  resource  to  another  Semantic  Web  resource?  Name  two  approaches  and  give  an  example  of  each.    

• We  can  compare  characters  of  the  labels  of  the  concepts.  I.e.  by  searching  on  different  languages.(Syntax  matching).      

   

• Taxonomy  or  Hierarchy  comparison.  We  search  for  matches  in  the  hierarchy  of  2  Semantic  web  resources.  I.e.  by  mapping  family  relationships.  

 5.  Can  the  same  resource  have  multiple  representations?  (Yes/No)    Yes,  in  example  a  car  part  like  a  tire.  We  can  state  that  this  could  be  a  subclass  of  a  car  but  also  a  subclass  of  rubber  transport  parts.  

                                                                                                               1  www.dbpedia.org    2  http://xmlns.com/foaf/spec/    3  http://www.geonames.org/ontology/documentation.html    4  http://www.w3.org/TR/owl-­‐ref/#sameAs-­‐def    

Developing  an  RDFa  Web  page  

Create  a  small  web  page,  for  example  a  personal  web  page  about  yourself  or  a  page  about  a  topic  your  interested  in.  Mark-­‐up  up  the  page  using  RDFa.  Be  sure  to  use  at  least  1  external  ontology.  Your  web  page  should  result  in  at  least  10  asserted  triples.  Check  that  your  web  page  has  correct  RDFa  mark-­‐up  by  using  http://inspector.sindice.com  (You  can  use  the  By  direct  input  tab).  Hand-­‐in:  Your  web  page  as  it  looks  in  a  browser;  the  source  code  (i.e.  HTML)  of  your  web  page;  the  output  of  the  Sindice  Inspector  including  rea-­‐oning;  A  paragraph  describing  whether  the  reasoning  is  what  you  expected  or  not.  

For  creating  my  own  personal  page  I  used  a  tool  called  Bootstrap5.  This  let’s  you  easily  create  a  webpage.  

 

 My  personal  webpage  made  with  Bootstrap  

                                                                                                               5  http://twitter.github.com/bootstrap/    

 Ontologies  given  by  Sindice  Inspector  

 Triples  given  by  Sindice  Inspector  

 

I  mostly  used  explicit  triples  within  my  html  code.  I’ve  added  one    external  ontology  to  foaf:Person  which  you  can  see  in  the  diagram.  The  reasoning  is  done  on  all  my  declared  span  statements.  I  can  state  that  I’ve  got  the  result  that  I  want  because  all  my  properties  all  listed.  I  however  didn’t  managed  to  notice  why    my  diagram  points  to  the  stylesheet  which  is  brought  with  Bootstrap.  

The  ontologies  that  are  being  retrieved  are  way  more  than  I  have  stated  in  my  HTML  file  as  prefixes.  It  looks  like  that  some  ontologies  already  refer  to  others.  That  could  be  the  reason  for  retrieving  so  many  with  Syndice  Inspector.  I  do  see  the  foaf  ontology  which  I  made  which  is  being  used  for  my  name.  

My  sourcecode  is  listed  in  ‘Appendix  1  –  HTML  sourcecode’  

       

Generated  graph  from  Sindice  inspector  

Converting  a  database  Use D2RQ to convert the Times Higher Education Rankings SQL database into RDF. This will be used in your final assignment. You can find the SQL database online on blackboard (timeshigher.sql). Dump the resulting RDF to a file. Also, perform one SPARQL query over the dataset. In your assignment: 1. Show a snippet of the RDF generated. 2. What syntax is it in? 3. Show the SPARQL query you performed. 1. I’ve loaded MySQL and managed to get the SGL dump running in the program ‘Sequal Pro.’

1. I’ve made a mapping.ttl file by commandline for using the D2RQ environment. Which gives me

Turtle syntax.

@prefix map: <#> . @prefix db: <> . @prefix vocab: <vocab/> . @prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> . @prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> . @prefix xsd: <http://www.w3.org/2001/XMLSchema#> . @prefix d2rq: <http://www.wiwiss.fu-berlin.de/suhl/bizer/D2RQ/0.1#> . @prefix jdbc: <http://d2rq.org/terms/jdbc/> . map:database a d2rq:Database; d2rq:jdbcDriver "com.mysql.jdbc.Driver"; d2rq:jdbcDSN "jdbc:mysql://localhost:3306/VUDatabase"; d2rq:username "root"; d2rq:password "test"; jdbc:autoReconnect "true"; jdbc:zeroDateTimeBehavior "convertToNull"; . # Table rankings

map:rankings a d2rq:ClassMap; d2rq:dataStorage map:database; d2rq:uriPattern "rankings/@@rankings.id@@"; d2rq:class vocab:rankings; d2rq:classDefinitionLabel "rankings"; . map:rankings__label a d2rq:PropertyBridge; d2rq:belongsToClassMap map:rankings; d2rq:property rdfs:label; d2rq:pattern "rankings #@@rankings.id@@"; . map:rankings_id a d2rq:PropertyBridge; d2rq:belongsToClassMap map:rankings; d2rq:property vocab:rankings_id; d2rq:propertyDefinitionLabel "rankings id"; d2rq:column "rankings.id"; d2rq:datatype xsd:integer; . map:rankings_order a d2rq:PropertyBridge; d2rq:belongsToClassMap map:rankings; d2rq:property vocab:rankings_order; d2rq:propertyDefinitionLabel "rankings order"; d2rq:column "rankings.order"; d2rq:datatype xsd:integer; . map:rankings_university a d2rq:PropertyBridge; d2rq:belongsToClassMap map:rankings; d2rq:property vocab:rankings_university; d2rq:propertyDefinitionLabel "rankings university"; d2rq:column "rankings.university"; . map:rankings_overall_score a d2rq:PropertyBridge; d2rq:belongsToClassMap map:rankings; d2rq:property vocab:rankings_overall_score; d2rq:propertyDefinitionLabel "rankings overall_score"; d2rq:column "rankings.overall_score"; d2rq:datatype xsd:double; . map:rankings_teaching a d2rq:PropertyBridge; d2rq:belongsToClassMap map:rankings; d2rq:property vocab:rankings_teaching; d2rq:propertyDefinitionLabel "rankings teaching"; d2rq:column "rankings.teaching"; d2rq:datatype xsd:double; . map:rankings_international_mix a d2rq:PropertyBridge; d2rq:belongsToClassMap map:rankings; d2rq:property vocab:rankings_international_mix; d2rq:propertyDefinitionLabel "rankings international_mix"; d2rq:column "rankings.international_mix"; d2rq:datatype xsd:double; . map:rankings_industry_income a d2rq:PropertyBridge; d2rq:belongsToClassMap map:rankings; d2rq:property vocab:rankings_industry_income; d2rq:propertyDefinitionLabel "rankings industry_income"; d2rq:column "rankings.industry_income"; d2rq:datatype xsd:double; . map:rankings_research a d2rq:PropertyBridge; d2rq:belongsToClassMap map:rankings; d2rq:property vocab:rankings_research; d2rq:propertyDefinitionLabel "rankings research"; d2rq:column "rankings.research"; d2rq:datatype xsd:double; . map:rankings_citations a d2rq:PropertyBridge; d2rq:belongsToClassMap map:rankings; d2rq:property vocab:rankings_citations; d2rq:propertyDefinitionLabel "rankings citations"; d2rq:column "rankings.citations"; d2rq:datatype xsd:double; .

3.  We’re  ready  to  go  to  perform  a  SPARQL  query  with  D2RQ.  I’ve  chosen  to  list  the  universities  with  only  a  higher  rating  than  80.0  points.  Which  is  listed  in  the  column  ‘rankings_overall_score‘.

 

The  SPARQL  query  for  retrieving  universities  only  with  a  higher  rate  then  80  

   

Appendix  1  –  HTML  sourcecode  <!DOCTYPE  html>  <html  version="HTML+RDFa  1.1"  lang="en"     xmlns="http://www.w3.org/1999/html"     xmlns:rdf="http://www.w3.org/1999/02/22-­‐rdf-­‐syntax-­‐ns#"     xmlns:rdfs="http://www.w3.org/2000/01/rdf-­‐schema#"     xmlns:xsd="http://www.w3.org/2001/XMLSchema#"     xmlns:dc="http://purl.org/dc/elements/1.1/"     xmlns:foaf="http://xmlns.com/foaf/0.1/"     xmlns:dbp="http://dbpedia.org/page/">         <head>       <meta  charset="utf-­‐8">       <title>Barry  Kollee</title>       <meta  name="viewport"  content="width=device-­‐width,  initial-­‐scale=1.0">       <meta  name="description"  content="">       <meta  name="author"  content="">         <link  href="css/bootstrap.css"  rel="stylesheet">       <style  type="text/css">         body  {           padding-­‐top:  60px;           padding-­‐bottom:  40px;         }         img  {           -­‐webkit-­‐box-­‐shadow:  2px  2px  6px  1px  rgba(0,  0,  0,  0.33);           box-­‐shadow:  2px  2px  6px  1px  rgba(0,  0,  0,  0.33);         }       </style>     </head>       <body>         <div  class="navbar  navbar-­‐inverse  navbar-­‐fixed-­‐top">         <div  class="navbar-­‐inner">           <div  class="container">             <a  class="brand"  href="#">Barry  Kollee</a>             <div  class="nav-­‐collapse  collapse">               <ul  class="nav">                 <li  class="active"><a  href="#">About  me</a></li>               </ul>             </div>           </div>         </div>       </div>         <div  class="container">         <div  class="row">                 <div  class="span2">           <img  style="margin-­‐top:  11px"  src="http://a   0.twimg.com/profile_images/1441095528/Schermafbeelding_2011-­‐07-­‐13_om_23.09.06.png"  width="200"  class="img-­‐rounded">         </div>         <div  class="span10">           <h4  property="name">Barry  Kollee</h4>           <blockquote  style="border-­‐left:0">           <p  class="muted">             My  name  is  <span  typeof="foaf:Person"  property="foaf:name">Barry  Kollee</span>.  I’m  a  student  of  the  <span  property="university">VU  university</span>.  This  page  has  been  made  as  an  assignment  for  the  the  course  Semantic  web.<br><br>             My  current  job  is  software  development  in  a  small  company  named  <span  property="company">Nakko</span>.  We  mostly  develop  <span  property="software">applications</span>  for  mobile  devices  like  <span  property="mobiledevice">iPhones</span>  and  <span  property="mobiledevice">Samsung  Galaxy</span>.  <br><br>On  the  other  hand  we’re  also  active  in  the  world  of  mobile  advertisement.           </p>           </blockquote>           <h4>My  interests</h4>           <blockquote  style="border-­‐left:0">           <p  class="muted">  

          My  interests  are  mostly  with  the  innovation  of  technique.  I  adore  <span  property="electronics">gadgets</span>  and  am  looking  forward  to  see  how  technology  will  evolve  in  the  upcoming  decades.             <br><br>             I’m  also  a  <span  property="sports">football</span>  player  at  a  local  footballclub  and  am  a  fan  of  the  football  club  from  <span  property="capitalOfHolland">Amsterdam</span>  called  <span  property="aDutchFootballclub">Ajax</span>.           </p>             </blockquote>         </div>         </div>           <hr>           <footer>                     <p>Barry  Kollee<br><br>             <span  property="foaf:mbox">b.kollee@student.vu.nl</span>           </p>         </footer>         </div>           <script  src="js/jquery.js"></script>       <script  src="js/bootstrap-­‐transition.js"></script>       <script  src="js/bootstrap-­‐alert.js"></script>       <script  src="js/bootstrap-­‐modal.js"></script>       <script  src="js/bootstrap-­‐dropdown.js"></script>       <script  src="js/bootstrap-­‐scrollspy.js"></script>       <script  src="js/bootstrap-­‐tab.js"></script>       <script  src="js/bootstrap-­‐tooltip.js"></script>       <script  src="js/bootstrap-­‐popover.js"></script>       <script  src="js/bootstrap-­‐button.js"></script>       <script  src="js/bootstrap-­‐collapse.js"></script>       <script  src="js/bootstrap-­‐carousel.js"></script>       <script  src="js/bootstrap-­‐typeahead.js"></script>       </body>  </html>