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

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


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


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


Architecture

• Wiki Engine: manage HTML documents

• Rhizomer: manage semantic metadata about them

linklink

#anchor

link

link

URL

URL

URL

URL

RHIZOMERWIKI ENGINE


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, http://www.fckeditor.net– WYSIWYG interface, text processor like– Personalise user interface

• E.g.: add custom special chars


Wiki Engine


Rhizomer

• Simplicity:– Abstraction layer on metadata stores

(Sesame, Jena,…).– Common SOAP interface +

RDF/ACL conversations– Implementation

• Java Servlets• JSP • JavaScript Metadata

Store

Rhizomer

SOAP

AgentCommun.Language


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

<HTML/>

<HTML/> SemFORMS

JavaScript


Rhizomer Architecture

search.html+JavaScript

Search FormSubmit

RDFSOAPSender

RDF/ACL query-ref / inform

RDF/ACL inform

results.jsp +XSLT

ResultsReturn

RDF Web Portal

Broker & Storage

SOAP(RDF/ACL)

Rhizomer

DB

MetadataStorePeer


Guided Tour: user input

= Property = Value NOTE: default namespace RDF/ACL

Semantics-enabled HTML Forms.

<form name="search" method="post" action=“RDFSOAPSender" onSubmit="search.content.value = buildRQL(search)"> <input name="http://purl.org/dc/elements/1.1/title" type="text"/> <select name="http://www.w3.org/1999/02/22-rdf-syntax-ns#type"> <option value="http://rhizomik.net/.../MP7Genres.rdfs#Music">... </select> ... <input type="hidden" name="performative" value="query-ref"> <input type="hidden" name="sender" value="search.html"> <input type="hidden" name="receiver" value=“rhizomer"> <input type="hidden" name="language" value=“SeRQL"> <input type="hidden" name="content" value=""> <input type="hidden" name="reply-to" value="results.jsp"></form> Search Form

SubmitRDFSOAP

Sender

Rhizomer

SOAP(RDF/ACL)

visible

hidden


Building a Semantic IntraWeb with Rhizomer and a Wiki — 12/20Rhizomer

Guided Tour: message content

On submit JavaScriptperformative=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}http://purl.org/dc/elements/1.1/title{Y0},{S}http://www.w3.org/.../22-rdf-syntax-ns#type{Y1}

where Y0 like “The Best of*” and Y1=http://rhizomik.net/.../MP7Genres.rdfs#Music

RDFSOAPSender

SOAP(RDF/ACL)

Search FormSubmit



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 FormSubmit

RDFSOAPSender

SOAP(RDF/ACL)

<SOAP-ENV:Envelope xmlns:… > ...<SOAP-ENV:Body> <rdf:RDF xmlns:acl=“http://daml.umbc.edu/acldaml” ...><acl:query-ref>

<acl:sender>http://rhizomik.net/rhizomer/search.html</acl:sender><acl:receiver>http://rhizomik.net/rhizomer/broker</acl:receiver><acl:language>RQL</acl:language><acl:content parseType=“Literal”>select graph(S)...</acl:content><acl:reply-to>http://rhizomik.net/rhizomer/results.jsp</acl:reply-to>

</acl:query-ref></rdf:RDF></SOAP-ENV:Body></SOAP-ENV:Envelope>


RDF/ACL inform

DB

MetadataStorePeer

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,…


Rhizomer

SOAP(RDF/ACL)


Rhizomer

RDF/ACL 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

MetadataStorePeer

DB

SOAP(RDF/ACL)


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

Fragment 2

Fragment 1

Fragment 3

Fragment 4

Identified Resource

Anonymous Resource

Literal

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

MetadataStorePeer

DB


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

ResultsReturn

RDFSOAPSender

SOAP(RDF/ACL)


Guided Tour: visualisation

<swrc:SoftwareProjectrdf:about="http://rhizomik.net/rhizomer">

<rdfs:label>Rhizomer</rdfs:label><swrc:homepage rdf:resource=

"http://rhizomik.net/content/rhizomer"/><rdf:type rdf:resource=“&swrc;ResearchProject"/>

</swrc:SoftwareProject>

view, RDF2HTML

edit, RDF2HTMLForm

view, RDF2HTML

search


Conclusions

• Usable framework (preliminary user tests)

• Simple and flexible– Example: Semantic Media Portal


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

Thank you for your attention

More at: http://rhizomik.net

[email protected]@diei.udl.es

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

Documents

semantic intraweb

rhizomer simplicity

proposal wiki

wiki engine simplicity

html documents rhizomer

rhizomer ease of use

semantic web technologies

semantic metadata graph