Building a Semantic IntraWeb with Rhizomer and a Wiki Roberto Garcia and Rosa Gil GRIHO (Human Computer Interaction Research Group) Universitat de Lleida, Spain

Building a Semantic IntraWeb with Rhizomer and a Wiki 2/20 Table of Contents Introduction Proposal Architecture Wiki Engine Rhizomer Rhizomer Architecture Guided tour Conclusions Future Work

Building a Semantic IntraWeb with Rhizomer and a Wiki 3/20 Introduction IntraWebs: group information sharing needs Web technologies: interaction issues, easy consumption / difficult production Wiki technologies: distributed production, difficult to keep information organised Semantic Web technologies: ontology for shared conceptualisations

Building a Semantic IntraWeb with Rhizomer and a Wiki 4/20 Proposal Wiki + Semantic Web Mix –Facilitate production –Keep information organisation Focus on simplicity and ease of use: –Simple wiki engine –WYSIWYG wiki user interface –Simple semantic metadata engine –Non RDF user interaction –Common HTML interface, just the web browser

Building a Semantic IntraWeb with Rhizomer and a Wiki 5/20 Architecture Wiki Engine: manage HTML documents Rhizomer: manage semantic metadata about them link #anchor link URL RHIZOMER WIKI ENGINE

Building a Semantic IntraWeb with Rhizomer and a Wiki 6/20 Wiki Engine Simplicity: –Based on Java Servlets / JSPs / JavaScript –No database required –Store documents as HTML files –Security: public / private areas Ease of use: –FCKEditor, –WYSIWYG interface, text processor like –Personalise user interface E.g.: add custom special chars

Building a Semantic IntraWeb with Rhizomer and a Wiki 7/20 Wiki Engine

Building a Semantic IntraWeb with Rhizomer and a Wiki 8/20 Rhizomer Simplicity: –Abstraction layer on metadata stores (Sesame, Jena,…). –Common SOAP interface + RDF/ACL conversations –Implementation Java Servlets JSP JavaScript Metadata Store Rhizomer SOAP Agent Commun. Language

Building a Semantic IntraWeb with Rhizomer and a Wiki 9/20 Rhizomer Ease of use: –Facilitate discovering unknown metadata Query results like SPARQL DESCRIBE –Web browser interface for semantic metadata Graph browsing mechanism Enable self-explanatory metadata RDF SemFORMS JavaScript

Building a Semantic IntraWeb with Rhizomer and a Wiki 10/20 Rhizomer Architecture search.html +JavaScript Search Form Submit RDFSOAP Sender RDF/ACL query-ref / inform RDF/ACL inform results.jsp + XSLT Results Return RDF Web Portal Broker & Storage SOAP(RDF/ACL) Rhizomer DB MetadataStore Peer

Building a Semantic IntraWeb with Rhizomer and a Wiki 11/20 Guided Tour: user input = Property = ValueNOTE: default namespace RDF/ACL Semantics-enabled HTML Forms. <form name="search" method="post" action=RDFSOAPSender" onSubmit="search.content.value = buildRQL(search)">... Search Form Submit RDFSOAP Sender Rhizomer SOAP(RDF/ACL) visible hidden search.html +JavaScript

Building a Semantic IntraWeb with Rhizomer and a Wiki 12/20 Rhizomer Guided Tour: message content On submit JavaScript performative=query-ref search.content=buildSeRQL(search): = Property = Value NOTE: built from visible form elements performative=inform search.content=RDF metadata to insert or delete. select graph(S) from {S} {S} where Y0 like The Best of* and Y1= RDFSOAP Sender SOAP(RDF/ACL) Search Form Submit search.html +JavaScript

Building a Semantic IntraWeb with Rhizomer and a Wiki 13/20 Rhizomer Guided Tour: message structure RDFSOAPSender servlet: FORM submission SOAP(RDF/ACL): = Property = Value NOTE: built from hidden form elements or acl:inform / acl:inform-not for insert/delete …then send it to acl:receiver URL. search.html + JavaScript Search Form Submit RDFSOAP Sender SOAP(RDF/ACL) RQL select graph(S)...

Building a Semantic IntraWeb with Rhizomer and a Wiki 14/20 RDF/ACL inform DB MetadataStore Peer DB Guided Tour: broker routing Web Service, SOAP interface. Common access point. Semantic routing input message to appropriate StorePeers, considers: –acl:language, acl:sender, acl:receiver,… RDF/ACL query-ref / inform Rhizomer SOAP(RDF/ACL)

Building a Semantic IntraWeb with Rhizomer and a Wiki 15/20 Rhizomer RDF/ACL inform RDF/ACL query-ref / inform Guided Tour: store peer JXTA(RDF/ACL) messages. Implementations for RDF stores (and QL): –Sesame StorePeer (SeRQL),… Input processing: –performative query/insert/delete. –acl:content query or metadata. Query output also RDF/ACL. –Problem: not usual RDF stores output RDF… DB Metadata StorePeer DB SOAP(RDF/ACL)

Building a Semantic IntraWeb with Rhizomer and a Wiki 16/20 Guided Tour: build response graph For all Resources R selected by query… Algorithm graph(R): Build graph of depth 1 from selected resources R. Blank node closure

Building a Semantic IntraWeb with Rhizomer and a Wiki 17/20 RDF/ACL query-ref / inform Guided Tour: join responses Rhizomer: –Receives StorePeers RDF responses. –Joins responses into unique RDF model. –Return RDF/ACL message to RDFSOAPSender. acl:content = RDF Model serialisation SOAP(RDF/ACL) Rhizomer RDF/ACL inform DB MetadataStore Peer DB

Building a Semantic IntraWeb with Rhizomer and a Wiki 18/20 Rhizomer Guided Tour: response presentation RDFSOAPSender: –Redirect to acl:reply-to URL for presentation. Result page: –Visualisation: XSLT: RDF to HTML or RDF to HTML FORM Inference + XSLT: RDF to SVG Other alternatives: RDF Path,… –Use RDF labels for usability, multilingual support. results.jsp + XSLT Results Return RDFSOAP Sender SOAP(RDF/ACL)

Building a Semantic IntraWeb with Rhizomer and a Wiki 19/20 Guided Tour: visualisation Rhizomer view, RDF2HTML edit, RDF2HTMLForm view, RDF2HTML search

Building a Semantic IntraWeb with Rhizomer and a Wiki 20/20 Conclusions Usable framework (preliminary user tests) Simple and flexible –Example: Semantic Media Portal

Building a Semantic IntraWeb with Rhizomer and a Wiki 21/20 Future Work AJAX to improve user interaction –Support back button –Assisted metadata creation… In deep user testing at the Metadata trust based on RDF signatures Fine grained access control

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