Creating Knowledge out of Interlinked Data

LOD2 Presentation . 02.09.2010 . Page

Facete

Claus Stadler

2015.09.15 GeoLD Workshop

Exploring the spatial Web of Data with

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FaceteA faceted browser for the Web of Data

AgendaAgenda

● MotivationMotivation

● Screenshot of FaceteScreenshot of Facete

● New FeaturesNew Features

● ArchitectureArchitecture

● JassaJassa

● Jassa-UIJassa-UI

● DemoDemo

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FaceteMotivation

The LinkedGeoData BrowserThe LinkedGeoData Browser

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FaceteMotivation

The LinkedGeoData BrowserThe LinkedGeoData Browser

● ““Naive SPARQL-based” browserNaive SPARQL-based” browser

● Cannot handle large amount of geometriesCannot handle large amount of geometries

● Cannot handle large amounts of featuresCannot handle large amounts of features

● Can only filter by classesCan only filter by classes

● Can only show direct properties of resourcesCan only show direct properties of resources

● Only works for WGS84Only works for WGS84

● No internationalizationNo internationalization

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FaceteA faceted browser for the Web of Data

Screenshot of the ApplicationScreenshot of the Application

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FaceteNew features

Integrated Dataset CatalogIntegrated Dataset Catalog

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FaceteNew features

RDF EditorRDF Editor

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Application Container (Tomcat, Jetty, ...)

FaceteArchitecture

ArchitectureArchitecture

Facete

SparqlQuery Cache

Client(Browser)

Server

RemoteSparqlEndpoints

Config

ConceptProperty Path Finder

SpringBatch

SparqlExporter

SpringBatch

JoinSummaries

Facete

Jassa Library Jassa UI LibraryApplication

Logic

EDIT

RDF Editing on the Web

1. Annotate your HTML 3. Get live feeback of the RDF and changes

2. Interact with your pre-filled form

Claus Stadler, Natanael Arndt, Michael Martin and Jens Lehmann

<div rex-subject=”dbr:Vienna” rex-predicate=”geo:geometry”>

<rdf-term-input ng-model=”wkt” rex-value=”wkt” />

<geometry-inputng-model=”wkt” rex-literal />

</div>

bower install jassa-ui-angular-edit https://github.com/GeoKnow/Jassa-UI-Angular

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FaceteArchitecture

Edit WorkflowEdit Workflow

Facete

Sparql Cache

Client(Browser)

Server

RemoteSparqlEndpoints

Facete UI Component Reset form to pristine

Invalidate server side cache

Invalidate client side cache

Create a new SparqlService object will refresh client components and edit forms

Sparql Service

UI Component RDF Editor

Sparql Cache

Sparql Service

https://github.com/GeoKnow/DataDrivenDependencyInjection-Angular

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FaceteA faceted browser for the Web of Data

The JAvascript Suite for Sparql Access (Jassa) LibraryThe JAvascript Suite for Sparql Access (Jassa) Library

rdfrdf.Node, rdf.NodeFactoryrdf.Tripel, rdf.Graphrdf.vocab.rdf.*, rdf.vocab.rdfs.*

sparql.Element*sparql.Expr*sparql.Concept

RDF core classesand vocabs

SPARQL syntaxclasses

serviceSPARQL serviceclasses

service.SparqlServiceHttpservice.SparqlServiceCacheservice.ResultSet

Purpose Module Excerpt of important Classes

sparql

depends on

depends on

sparqlService = new service.SparqlServiceHttp('http://dbpedia.org/sparql'['http://dbpedia.org']);sparqlService = new service.SparqlServiceCache(sparqlService);sparqlService = new service.SparqlServiceVirtFix(sparqlService);sparqlService = new service.SparqlServicePaginate(sparqlService, 1000);sparqlService = new service.SparqlServicePageExpand(sparqlService, 100);var qe = sparqlService.createQueryExecution('Select * { ?s ?p ?o } Limit 10'qe.setTimeout(5000);qe.execSelect().then(function(rs) { while(rs.hasNext()) { /* ... */ } });

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FaceteA faceted browser for the Web of Data

The JAvascript Suite for Sparql Access (Jassa) LibraryThe JAvascript Suite for Sparql Access (Jassa) Library

sponate sponate.Mapsponate.StoreFacade

facete

SPARQL result setto JSON document mapper

Supports regex search, limit,offset, counting, …on virtual JS documentsrather than raw result set rows

facete.FacetConfigfacete.FacetServicefacete.FacetTreeConfigfacete.FacetTreeService

serviceSPARQL serviceclasses

service.SparqlServiceHttpservice.SparqlServiceCacheservice.ResultSet

Purpose Module Excerpt of important Classes

depends on

depends on

depends on

Faceted Search module

Supports nested facets;regex search, paginationfor both facets and facetvalues

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FaceteJassa-UI

Jassa-UI - User Interface ComponentsJassa-UI - User Interface Components

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FaceteDemo

AgendaAgenda

DemoDemo

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FaceteAchievements

IssuesIssues

● Cannot handle large amounts of geometries

● Large amounts of Geometries supported viaLarge amounts of Geometries supported viaclient side Sparql-based clustering using bounding boxesclient side Sparql-based clustering using bounding boxes

● Cannot handle large amounts of features

● Intensional description of the set of resources matchingIntensional description of the set of resources matchingthe facet constraints enables paginationthe facet constraints enables pagination

● Can only filter by classes

● Can filter by values of any propertyCan filter by values of any property

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FaceteAchievements

IssuesIssues

● Can only show direct properties of resources

● Can show values of indirectly related (inverse) propertiesCan show values of indirectly related (inverse) properties

● Only works for WGS84

● Geometry Literals (GeoSPARQL / Virtuoso), WGS84, GeoRSSGeometry Literals (GeoSPARQL / Virtuoso), WGS84, GeoRSS

● Indirection supportedIndirection supported

● No internationalization

● Preferred languages and labelPreferred languages and labelproperties supported via Sponateproperties supported via Sponate

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FaceteFuture Work

InterlinkingInterlinking

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FaceteDemo

The EndThe End

Thank You!Thank You!

Questions?Questions?

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FaceteLinks

Related LinksRelated Links

● http://facete.aksw.org/http://facete.aksw.org/

● https://github.com/GeoKnow/Facete2https://github.com/GeoKnow/Facete2

JavaScript ComponentsJavaScript Components

● https://github.com/GeoKnow/Jassahttps://github.com/GeoKnow/Jassa

● https://github.com/GeoKnow/Jassa-UI-Angularhttps://github.com/GeoKnow/Jassa-UI-Angular

Java ComponentsJava Components

● https://github.com/AKSW/jena-sparql-apihttps://github.com/AKSW/jena-sparql-api

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FaceteProperty Path Finding

Concept Property Path Finding (Sketch)Concept Property Path Finding (Sketch)

({?s a Project}, ?s)

({?s long ?x ; lat ?y}, ?s)

Create a graph whereeach node corresponds to a property, andeach edge corresponds to a connection between these properties

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FaceteMotivation

Jassa – Faceted Browsing Module (Facete-Module)Jassa – Faceted Browsing Module (Facete-Module)

var facetConfig = new facete.FacetConfig();var constraintPath = facete.Path.parse('http://www.w3.org/1999/02/22-rdf-syntax-ns#type');

facetConfig.getConstraintManager().addConstraint(new facete.ConstraintEquals(constraintPath,

rdf.NodeFactory.createUri('http://fp7-pp.publicdata.eu/ontology/Project')));

var facetValueService = new facete.FacetValueService(sparqlService,facetConfig, 5000000);

var path = facete.Path.parse('http://fp7-pp.publicdata.eu/ontology/funding http://fp7-pp.publicdata.eu/ontology/partner http://fp7-pp.publicdata.eu/ontology/address http://fp7-pp.publicdata.eu/ontology/country');

facetValueService.prepareListService(path).then(function(ls) { ls.fetchItems().then(function(items) { /* … */ });});

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FaceteMotivation

Jassa – Sparql To JavaScript Mapper (Sponate)Jassa – Sparql To JavaScript Mapper (Sponate)

● Inspired by SParql + jsON + hibernATEInspired by SParql + jsON + hibernATEstore = new sponate.StoreFacade(sparqlService, { 'rdf': 'http://www.w3.org/1999/02/22-rdf-syntax-ns#'

/* ... */});

store.addMap({ name: 'castles', template: [{

id: '?s', displayLabel: { $ref: { target: 'labels', attr: 'displayLabel' }} }],

from: '?s a dbpedia-owl:Castle'});

store.addMap({ name: 'labels', template: [{

id: '?s', displayLabel: new AggBestLabel('s', 'p', 'o', ['en', 'de', ''], ['skos:prefLabel', 'rdfs:label', 'doap:name']), hiddenLabels: ['?o'] }], from: '?s ?p ?o . Filter(?p In (skos:prefLabel, rdfs:label, doap:name))'});

store.castles.find().limit(10).list().then(function(castles) { /* ... */});