OntoWiki Application Framework & Erfurt API

Creating Knowledge out of Interlinked Data Developing Linked Data Applications with the LOD2 Stack OntoWiki Application Framework & Erfurt API Philipp Frischmuth AKSW, Universität LeipzigLOD2 Presentation . 02.09.2010 . Page http://lod2.eu

Creating Knowledge out of Interlinked DataAgenda Semantic Wiki OntoWiki • Differences • Similarities • Demo Architecture • Erfurt • OntoWiki AF Use CasesISSLOD 2011 . 2011-09-14 . Leipzig . Page 2 http://lod2.eu

Creating Knowledge out of Interlinked DataSemantic Wiki • Wiki with added semantics • Goal: Wiki pages + background knowledge base • Examples: Semantic MediaWiki, Rhizome, IkeWiki • OntoWiki takes another approachISSLOD 2011 . 2011-09-14 . Leipzig . Page http://lod2.eu

Creating Knowledge out of Interlinked DataOntoWiki Semantic (Data-)WikiISSLOD 2011 . 2011-09-14 . Leipzig . Page 4 http://lod2.eu

Creating Knowledge out of Interlinked Data Conceptual DifferencesISSLOD 2011 . 2011-09-14 . Leipzig . Page 5 http://lod2.eu

Creating Knowledge out of Interlinked DataViews over Articles Resource views Wiki articlesISSLOD 2011 . 2011-09-14 . Leipzig . Page 6 http://lod2.eu

Creating Knowledge out of Interlinked DataForms over Markup Forms Wiki codeISSLOD 2011 . 2011-09-14 . Leipzig . Page 7 http://lod2.eu

Creating Knowledge out of Interlinked Data Why do you call that thing a Wiki? Conceptual SimilaritiesISSLOD 2011 . 2011-09-14 . Leipzig . Page 8 http://lod2.eu

Creating Knowledge out of Interlinked DataWikiWikiWeb © Andrew LaingISSLOD 2011 . 2011-09-14 . Leipzig . Page 9 http://lod2.eu

Creating Knowledge out of Interlinked DataWikiwiki Concepts • Everyone can edit anything • Content is edited in the same way as structure is • Activity can be watched and reviewed by everyone Ward CunninghamISSLOD 2011 . 2011-09-14 . Leipzig . Page 10 http://lod2.eu

Creating Knowledge out of Interlinked DataVersioning Everything can be undone Philosophy: make it easy to correct mistakesISSLOD 2011 . 2011-09-14 . Leipzig . Page 11 http://lod2.eu

Creating Knowledge out of Interlinked DataVision 1. Generic data wiki for RDF models • No data model mismatch (structured vs. unstructured) 2. Application framework: • Knowledge-intensive applications, • Agile processes, • Distributed user groupsISSLOD 2011 . 2011-09-14 . Leipzig . Page 12 http://lod2.eu

Creating Knowledge out of Interlinked Data DemoISSLOD 2011 . 2011-09-14 . Leipzig . Page 13 http://lod2.eu

Creating Knowledge out of Interlinked DataArchitecture RDFauthor Extensions OntoWiki Application Framework Erfurt API Zend FrameworkISSLOD 2011 . 2011-09-14 . Leipzig . Page 14 http://lod2.eu

Creating Knowledge out of Interlinked DataZend Framework • PHP Framework for web applications • Extensive documentation • Outstanding code quality • BSD-licensed • Flexibly usableISSLOD 2011 . 2011-09-14 . Leipzig . Page 15 http://lod2.eu

Creating Knowledge out of Interlinked DataZend Framework contd. Provides MVC environment Model Controller ViewISSLOD 2011 . 2011-09-14 . Leipzig . Page 16 http://lod2.eu

Creating Knowledge out of Interlinked DataZend Framework contd. Provides MVC environment Model Controller View • Business logic • SPARQL is here!ISSLOD 2011 . 2011-09-14 . Leipzig . Page 16 http://lod2.eu

Creating Knowledge out of Interlinked DataZend Framework contd. Provides MVC environment Model Controller View • Business logic • Components • SPARQL is here! • Controllers methods are called actions • Accessible via URLsISSLOD 2011 . 2011-09-14 . Leipzig . Page 16 http://lod2.eu

Creating Knowledge out of Interlinked DataZend Framework contd. Provides MVC environment Model Controller View • Business logic • Components • OntoWiki_View • SPARQL is here! • Controllers methods class are called actions • Templates run in • Accessible via URLs View‘s context • View‘s variables ﬁlled within the controllerISSLOD 2011 . 2011-09-14 . Leipzig . Page 16 http://lod2.eu

Creating Knowledge out of Interlinked DataZend Framework contd. Auth Cache Conﬁg Controller Feed Log OpenId Session Uri View XmlRpc ...ISSLOD 2011 . 2011-09-14 . Leipzig . Page 17 http://lod2.eu

Creating Knowledge out of Interlinked DataErfurt API • Based on ZF • Components: • Triple (Quad) Store abstraction • Authentication + access control • SPARQL support • Caching • Versioning • ...ISSLOD 2011 . 2011-09-14 . Leipzig . Page 19 http://lod2.eu

Creating Knowledge out of Interlinked DataErfurt Packages Ac App Auth Cache Event Namespaces Owl Plugin Rdf Rdfs Sparql Store Syntax Uri Utils Versioning WrapperISSLOD 2011 . 2011-09-14 . Leipzig . Page 20 http://lod2.eu

Creating Knowledge out of Interlinked DataApp package • Contains only one class: Erfurt_App • Base for every Erfurt application • Singleton pattern $config = new Zend_Config_Ini(/path/to/config.ini, default, true); // initialize Erfurt application $app = Erfurt_App::start($config);ISSLOD 2011 . 2011-09-14 . Leipzig . Page 21 http://lod2.eu

Creating Knowledge out of Interlinked DataApp package contd. • Access Erfurt_App instance from everywhere $app = Erfurt_App::getInstance(); • Contains shortcut methods $app->authenticate(); $app->addUser($username, $password, $email); $app->isActionAllowed($actionSpec);ISSLOD 2011 . 2011-09-14 . Leipzig . Page 22 http://lod2.eu

Creating Knowledge out of Interlinked DataApp package contd. • Grants access to required objects, e.g.: // access the Zend_Auth instance $auth = $app->getAuth(); // access the Erfurt_Ac_Default instance $ac = $app getAc(); // access the Efurt_Store instance $store = $app->getStore(); // access the Erfurt_Cache object, if caching enabled $cache = $app->getCache(); // access the Erfurt_Log object, if logging is enabled $log = $app->getLog()ISSLOD 2011 . 2011-09-14 . Leipzig . Page 23 http://lod2.eu

Creating Knowledge out of Interlinked Data Ac App Auth Cache Event Namespaces Owl Plugin Rdf Rdfs Sparql Store Syntax Uri Utils Versioning WrapperISSLOD 2011 . 2011-09-14 . Leipzig . Page 24 http://lod2.eu

Creating Knowledge out of Interlinked DataAuth & Ac packages • RDF based authentication and access control • Model, action (and statement) based • Users & groups • Built-in system ontology contains vocabulary • ConﬁgurableISSLOD 2011 . 2011-09-14 . Leipzig . Page 25 http://lod2.eu

Creating Knowledge out of Interlinked DataAuth & Ac packages contd. <sioc:User rdf:about="Admin" rdfs:label="Admin"> <rdfs:comment>This is the pre-configured Admin User.</rdfs:comment> <foaf:accountName rdf:datatype="&xsd;string">Admin</foaf:accountName> </sioc:User> <sioc:Usergroup rdf:about="AdminGroup" rdfs:label="AdminGroup"> <sysont:denyModelEdit rdf:resource="&SysOnt;"/> <sysont:grantAccess rdf:resource="&SysOnt;AnyAction"/> <sysont:grantModelEdit rdf:resource="&SysOnt;AnyModel"/> <sysont:grantModelView rdf:resource="&SysOnt;AnyModel"/> <rdfs:comment>The group of all admins. If not changed, they can trigger all actions and can edit all models but the system ontology.</rdfs:comment> <sioc:has_member rdf:resource="Admin"/> </sioc:Usergroup>ISSLOD 2011 . 2011-09-14 . Leipzig . Page 26 http://lod2.eu

Creating Knowledge out of Interlinked DataAuth & Ac packages contd. • Authenticate a user $app->authenticate(Admin, secretpassword); • Logout $app->getAuth()->clearIdentity(); • Gather user information $user = $app->getAuth()->getIdentity(); • Add a new user $app->addUser($username, $password, $email);ISSLOD 2011 . 2011-09-14 . Leipzig . Page 27 http://lod2.eu

Creating Knowledge out of Interlinked DataAuth & Ac packages contd. • Model based access control $app->getAc()->isModelAllowed(view, $modelUri); $app->getAc()->isAnyModelAllowed(view); $app->getAc()->getAllowedModels(view); $app->getAc()->getDeniedModels(edit); • Action based access control $app->getAc()->isActionAllowed(RegisterNewUser); $app->getAc()->isAnyActionAllowed(); $app->getAc()->getAllowedActions(); $app->getAc()->getDeniedActions();ISSLOD 2011 . 2011-09-14 . Leipzig . Page 28 http://lod2.eu

Creating Knowledge out of Interlinked DataStore package • Developers use Erfurt_Store class • Represents a triple (quad) store • Abstracts different backends • Adapter patternISSLOD 2011 . 2011-09-14 . Leipzig . Page 30 http://lod2.eu

Creating Knowledge out of Interlinked DataStore package contd. Erfurt_App $app->getStore(); Erfurt_Store Zend_Db Virtuoso ... PostgreSQL MS SQL MySQL SQLite Oracle ...ISSLOD 2011 . 2011-09-14 . Leipzig . Page 31 http://lod2.eu

Creating Knowledge out of Interlinked DataStore package contd. • Obtain new and existing models $app->getStore()->getModel($modelUri); $app->getStore()->getNewModel($modelUri, $baseUri, owl); • Remove models from store $app->getStore()->deleteModel($modelUri); • Executes the tasks of Model classes, e.g. SPARQL, adding and removing triples • Imports and exports RDF in different formats, e.g. RDF/XML, N3, RDF/JSONISSLOD 2011 . 2011-09-14 . Leipzig . Page 32 http://lod2.eu

Creating Knowledge out of Interlinked DataRdf, Rdfs & Owl packages Erfurt_Rdf_Node inheritance Erfurt_Rdf_Resource Erfurt_Rdf_Literal Erfurt_Rdfs_Resource Erfurt_Rdfs_Property Erfurt_Rdfs_Instance Erfurt_Rdfs_Class Erfurt_Owl_Property Erfurt_ Owl_Instance Erfurt_ Owl_Class Erfurt_Rdf_Model Erfurt_Rdfs_Model Erfurt_Owl_ModelISSLOD 2011 . 2011-09-14 . Leipzig . Page 34 http://lod2.eu

Creating Knowledge out of Interlinked DataRdf, Rdfs & Owl packages contd. • Add and delete statements through model class $model->addStatement($s, $p, $o, $options); $model->deleteStatement($s, $p, $o, $options); $model->deleteMatchingStatements($s, null, null, $options); • Simple way to execute SPARQL queries through model classISSLOD 2011 . 2011-09-14 . Leipzig . Page 35 http://lod2.eu

Creating Knowledge out of Interlinked DataSparql package • Derived from rdfapi-php (RAP) • Transforms SPARQL Queries to SQL Queries • Result renderers • Improvements and bug ﬁxesISSLOD 2011 . 2011-09-14 . Leipzig . Page 37 http://lod2.eu

Creating Knowledge out of Interlinked DataSparql package contd. • Execute a SPARQL Query $model->sparqlQueryWithPlainResult(SELECT ?s ?p ?o WHERE {?s ?p ?o}); • Result is an array containing s, p and o as keys • Values are stringsISSLOD 2011 . 2011-09-14 . Leipzig . Page 38 http://lod2.eu

Creating Knowledge out of Interlinked DataSparql package contd. • More ﬂexible way through store class $queryObj = Erfurt_Sparql_SimpleQuery::initWithString(SELECT...{ ?s ?p ?o }); $app->getStore()->sparqlQuery($queryObj, xml);ISSLOD 2011 . 2011-09-14 . Leipzig . Page 39 http://lod2.eu

Creating Knowledge out of Interlinked DataEvent & Plugin packages • Event dispatcher • Plugin manager • Base for Erfurt and OntoWiki pluginsISSLOD 2011 . 2011-09-14 . Leipzig . Page 41 http://lod2.eu

Creating Knowledge out of Interlinked DataCache package • Caching of exspensive SPARQL queries • Uses triple patterns for invalidation • Object cache for complex/expensive resultsISSLOD 2011 . 2011-09-14 . Leipzig . Page 43 http://lod2.eu

Creating Knowledge out of Interlinked DataErfurt on Github • Erfurt is open source • Github: https://github.com/AKSW/ErfurtISSLOD 2011 . 2011-09-14 . Leipzig . Page 44 http://lod2.eu

Creating Knowledge out of Interlinked DataInterfaces • SPARQL Endpoint • Linked Data Endpoint • WebDAV • REST API • Command Line Interface • LDAPISSLOD 2011 . 2011-09-14 . Leipzig . Page 46 http://lod2.eu

Creating Knowledge out of Interlinked DataExtensibility • Components, Plugins, Modules, Wrapper • Views/Templates • Themes • LocalizationsISSLOD 2011 . 2011-09-14 . Leipzig . Page 47 http://lod2.eu

Creating Knowledge out of Interlinked DataAccess Control • Model-based • Action-based • (Statement-based)ISSLOD 2011 . 2011-09-14 . Leipzig . Page 48 http://lod2.eu

Creating Knowledge out of Interlinked DataRDFauthor • Automatically generates forms from RDFa annoated content • JavaScript library • Used within OntoWiki but independent RDFa • „Save to OntoWiki“ functionalityISSLOD 2011 . 2011-09-14 . Leipzig . Page 50 http://lod2.eu

Creating Knowledge out of Interlinked DataComponents • Provide controller • Access via URL • Custom views (optional) • Map, OpenId, CommunityISSLOD 2011 . 2011-09-14 . Leipzig . Page 52 http://lod2.eu

Creating Knowledge out of Interlinked DataModules • „Little Boxes“ • Provide additional GUI- elements • Navigation, LoginISSLOD 2011 . 2011-09-14 . Leipzig . Page 53 http://lod2.eu

Creating Knowledge out of Interlinked DataPlugins • Register for events • Execution of arbitrary code • Manipulation of input data • Versioning, image linksISSLOD 2011 . 2011-09-14 . Leipzig . Page 54 http://lod2.eu

Creating Knowledge out of Interlinked DataWrapper • Generate RDF data for arbitrary resources • Examples: • Linked Data • Exif • Geodata • TwitterISSLOD 2011 . 2011-09-14 . Leipzig . Page 55 http://lod2.eu

Creating Knowledge out of Interlinked DataExtension mechanisms • Components • Modules • Plugins • Wrapper • Additional: Themes, LocalizationsISSLOD 2011 . 2011-09-14 . Leipzig . Page 56 http://lod2.eu

Creating Knowledge out of Interlinked Data Use CasesISSLOD 2011 . 2011-09-14 . Leipzig . Page 57 http://lod2.eu

Creating Knowledge out of Interlinked DataSoftWiki Platform • Collaborative requirements engineering • OntoWiki base system • Custom viewsISSLOD 2011 . 2011-09-14 . Leipzig . Page 58 http://lod2.eu

Creating Knowledge out of Interlinked DataISSLOD 2011 . 2011-09-14 . Leipzig . Page 59 http://lod2.eu

Creating Knowledge out of Interlinked DataCaucasian Spiders • Faunistic database on spiders of the Caucasus • Taxonomy • Localities • 240k triplesISSLOD 2011 . 2011-09-14 . Leipzig . Page 60 http://lod2.eu

Creating Knowledge out of Interlinked DataVakantieland.nl • Dutch tourism portal • Independent application based on Erfurt • OntoWiki for data managementISSLOD 2011 . 2011-09-14 . Leipzig . Page 62 http://lod2.eu

Creating Knowledge out of Interlinked DataCatalogus Professorum • Knowledge base with historical data • Teaching staff of Universität Leipzig • Generic OntoWiki with Virtuoso backend for data management • Generation of HTML pages from RDF contentISSLOD 2011 . 2011-09-14 . Leipzig . Page 64 http://lod2.eu

Creating Knowledge out of Interlinked DataOntoWiki on Google Code • OntoWiki is open source • Google Code: • http://code.google.com/p/ontowiki/ISSLOD 2011 . 2011-09-14 . Leipzig . Page 67 http://lod2.eu

Creating Knowledge out of Interlinked Data Thank you for your attention!LOD2 Presentation . 02.09.2010 . Page http://lod2.eu

Creating Knowledge out of Interlinked Data Thank you for your attention!LOD2 Presentation . 02.09.2010 . Page Questions? http://lod2.eu

OntoWiki Application Framework & Erfurt API

by Philipp Frischmuth on Sep 15, 2011

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OntoWiki Application Framework & Erfurt API — Presentation Transcript