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LDP4j: A framework for the development of interoperable read-write Linked Data applications

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Nandana Mihindukulasooriya
Nandana Mihindukulasooriya

The document discusses ldp4j, a Java-based framework for developing interoperable read-write linked data applications. It details the features, architecture, and application development process using ldp4j, along with its current status, future work, and specific examples of its implementation, like Bugzilla and Morph-LDP. The presentation emphasizes the framework's capabilities in simplifying business logic while complying with linked data protocols and standards.

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Center for Open Middleware LDP4j: A framework for the development of interoperable read-write Linked Data applications Miguel Esteban Gutiérrez, Nandana Mihindukulasooriya, Raúl García Castro Center for Open Middleware / Ontology Engineering Group Universidad Politécnica de Madrid, Spain. @nandanamihindu / nmihindu@fi.upm.es
Center for Open Middleware Agenda 2 • Introduction • Developing a read-write Linked Data application • LDP4j to the rescue • LDP4j 101 • LDP4j in use • Current status • Future work
Center for Open Middleware Introduction chocolate 3 • Linked Data Platform • a standard protocol for read-write Linked Data • LDP application ‘flavors’ • vanilla vs. chocolate (application-specific) • Interoperability LDP Resource (LDPR) Non-RDF Source (LDP-NR) RDF Source (LDP-NR) LDP Container (LDPC) Basic Container Direct Container Indirect Container vanilla LDP Clients Data model Business logic
Center for Open Middleware Developing a read-write Linked Data Application What we have to consider 4 R+W LD Business Logic HTTP Syntax Routing Operation semantics Content negotiation Conditional requests • RFC 2616, 3986, 7230-7235 LDP RDF Sources Containers (Basic, direct, and indirect) Paging RDF transformation • LDP (and paging) 1.0 • RDF 1.1 • LD+JSON • RFC 3987, 5785, 5789, 5988, 6585, 7240 REST best practices Client-server Stateless Cacheable Layered system Uniform interface • Fielding, 2000; • Fielding & Taylor, 2002
Center for Open Middleware Developing a read-write Linked Data Application What we can use up-to-now Servlet 3.0 JAX-RS 5 REST best practices HTTP LDP R+W LD Business Logic RDF Parsers/Serializers Third party apps and utilities that support LDP • LDP (and paging) 1.0 • RDF 1.1 • LD+JSON • RFC 3987, 5785, 5789, 5988, 6585, 7240 • Fielding, 2000; • Fielding & Taylor, 2002 • RFC 2616, 3986, 7230-7235 Syntax and routing No support at all Only for RDF-based data access
Center for Open Middleware LDP4j to the rescue 6 • Java-based framework for the development of read-write Linked Data applications • Motto: Focus on your business logic, we will take care of the rest • License: Apache License, v2.0 • Features: • Simplified business object handling: • Lifting from and lowering to an intermediate representation that can be automatically unmarshalled from or marshalled to RDF, respectively. • LDP support • Protocol conversation control • Transparent metadata management • REST aware • Transparent publication of RDF URIRefs. • HTTP compliant • The framework takes care of fulfilling the requirements prescribed by the HTTP related RFCs (i.e., conditional requests processing, content negotiation, entity tag handling,…) www.ldp4j.org contact@ldp4j.org https://github.com/ldp4j/ldp4j @LDP4j
Center for Open Middleware LDP4j 101 High level architecture 7 Application API Application Engine Server Frontend Client Frontend R+W LD App. Consumer R+W LD App. Provider • LDP protocol handling • RDF transformation • Application management • Resource management • Endpoint management Server side HTTP handling • Templating annotations • Application configuration • Handler API • Handler extensibility APIs • Data manipulation API • State manipulation API Client side HTTP handling
Center for Open Middleware LDP4j 101 Application model 8 Application Template Resource Endpoint Handler Session Snapshot publishes manipulates surrogateOf manages uses handledBy definesSemantics definesDeploymentPolicies Dataset exchanges provides
Center for Open Middleware LDP4j 101 Application API 9 «describes» «annotation» Resource «describes» Application ResourceHandler Bootstrap Environment ContainerHandler DataSet Modifiable Deletable «uses» «uses» «produces» «uses» Individual Value Property Literal «extend» ContainerSnapshot ResourceSnapshot members «provides» «uses» ReadSession WriteSession AttachmentSnapshot «refersTo» ManagedIndividual LocalIndividual ExternalIndividual «represents» Configuration «uses» «uses» «annotation» BasicContainer «annotation» DirectContainer «annotation» IndirectContainer «describes» «describes» attachments «uses» «uses» «uses» «uses»
Center for Open Middleware LDP4j 101 Execution Pipeline Dispatch request Preprocess request Op. Request Prepare Input data Op. Response Prepare response Create application session Dataset lowering RDF marshalling Execute business logic Terminate application session Enrich response data with LDP metadata Dataset Dataset Application Engine Server Frontend Client LDP4j Application 10 Handle resource lifecycle changes Handle endoint lifecycle changes LDP header generation Check LDP metadata consistency Remove LDP metadata Content negotiation handling Entity unmarshalling RDF lifting Conditional request handling LDP header analysis
Center for Open Middleware LDP4j 101 Recipe for using LDP4j 11 1. Get LDP4j sources 2. Build LDP4j sources 3. Create a maven web-app project 4. Implement your business logic 5. Build the project 6. Deploy onto an servlet container 7. Enjoy!!!
Center for Open Middleware LDP4j 101 Developing an application 12 • Create a maven web-app project: <?xml version="1.0" encoding="UTF-8"?> <project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd" xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"> <!-- Module coordinates here --> <packaging>war</packaging> <properties> <ldp4j.version>1.0.0-SNAPSHOT</ldp4j.version> <!-- Other properties here --> </properties> <dependencies> <dependency> <groupId>org.ldp4j.framework</groupId> <artifactId>ldp4j-application-api</artifactId> <version>${ldp4j.version}</version> </dependency> <dependency> <groupId>org.ldp4j.framework</groupId> <artifactId>ldp4j-server-core</artifactId> <scope>runtime</scope> <version>${ldp4j.version}</version> </dependency> <!-- Other dependencies here --> </dependencies> <!-- Other build setting here --> </project>
Center for Open Middleware LDP4j 101 Developing an application 13 package org.example; import org.ldp4j.application.data.DataSet; import org.ldp4j.application.ext.Deletable; import org.ldp4j.application.ext.ResourceHandler; import org.ldp4j.application.session.ResourceSnapshot; import org.ldp4j.application.session.WriteSession; public class MyDeletableResourceHandler implements ResourceHandler, Deletable { @Override public DataSet get(ResourceSnapshot resource) { // TODO Implement your data retrieval logic return null; } @Override public void delete(ResourceSnapshot resource, WriteSession session) { // TODO Implement your deletion logic } } • Implement your resource handlers…
Center for Open Middleware LDP4j 101 Developing an application 14 package org.example; import org.ldp4j.application.data.DataSet; import org.ldp4j.application.ext.ContainerHandler; import org.ldp4j.application.ext.ContentProcessingException; import org.ldp4j.application.ext.Modifiable; import org.ldp4j.application.session.ContainerSnapshot; import org.ldp4j.application.session.ResourceSnapshot; import org.ldp4j.application.session.WriteSession; public class MyModifiableContainerHandler implements ContainerHandler, Modifiable { @Override public DataSet get(ResourceSnapshot resource) { // TODO Implement your data retrieval logic return null; } @Override public ResourceSnapshot create(ContainerSnapshot container, DataSet representation, WriteSession session) { // TODO Implement your creation logic here return null; } @Override public void update(ResourceSnapshot resource, DataSet content, WriteSession session) throws ContentProcessingException { // TODO Implement your modification logic here } } • … and container handlers:
Center for Open Middleware LDP4j 101 Developing an application 15 package org.example; ... import org.ldp4j.application.ext.annotations.BasicContainer; @BasicContainer( id = "containerTemplateId", memberHandler = MyDeletableResourceHandler.class ) public class MyModifiableContainerHandler implements ContainerHandler, Modifiable { ... } • Annotate the handlers: package org.example; ... import org.ldp4j.application.ext.annotations.Resource; @Resource( id="resourceTemplateId" ) public class MyDeletableResourceHandler implements ResourceHandler, Deletable { ... }
Center for Open Middleware LDP4j 101 Developing an application 16 package org.example; import org.ldp4j.application.data.Name; import org.ldp4j.application.data.NamingScheme; import org.ldp4j.application.ext.Application; import org.ldp4j.application.ext.Configuration; import org.ldp4j.application.session.WriteSession; import org.ldp4j.application.setup.Bootstrap; import org.ldp4j.application.setup.Environment; public class MyApplication extends Application<Configuration> { @Override public void setup(Environment environment, Bootstrap<Configuration> bootstrap) { MyModifiableContainerHandler containerHandler=new MyModifiableContainerHandler(); MyDeletableResourceHandler resourceHandler=new MyDeletableResourceHandler(); // TODO Your handler configuration logic here bootstrap.addHandler(resourceHandler); bootstrap.addHandler(containerHandler); Name<?> rootContainerName=NamingScheme.getDefault().name("containerName") ; environment.publishResource(rootContainerName, MyModifiableContainerHandler.class, "containerRootPath"); } @Override public void initialize(WriteSession session) { // TODO Your handler initialization logic here // Remember, the session has to be updated to reflect the state of the data managed by the handlers } @Override public void shutdown() { // TODO Your shutdown logic here } } • Implement your application class:
Center for Open Middleware LDP4j 101 Developing an application 17 • Update the web application descriptor: <?xml version="1.0" encoding="UTF-8"?> <web-app metadata-complete="false" version="3.0" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation=" http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"> <display-name>My LDP4j Application</display-name> <context-param> <param-name>ldp4jTargetApplication</param-name> <param-value>org.example.MyApplication</param-value> </context-param> <!-- Other configuration here --> </web-app>
Center for Open Middleware LDP4j in Use The Bugzilla adapter 18 • Exposes Bugzilla as an LDP-enabled application ALM iStack ontology  RDF  HTTP Headers LDP Clients Bugzilla LDP Adapter  XML-RPC  Native data model An example of bug creation POST /ita/containers/bugs HTTP/1.1 Host: localhost Content-Type: text/turtle @prefix ai: <http://delicias.dia.fi.upm.es/ontologies/alm-istack#> . …rest of the namespace declarations are omitted for brevity. <> a ai:ClientDefect; dcterms:creator <http://localhost/ita/ldp/resources/users/9> ; dcterms:title "Bugzilla adapter build is broken"^^xsd:string; dcterms:description "Bugzilla adapter build fails due to a test failure"^^xsd:string; oslc_asset:relatedAsset <http://localhost/ita/ldp/resources/versions/16> ; ai:relatedIncident <https://bugzilla.mozilla.org/show_bug.cgi?id=730698> . HTTP/1.1 201 Created Location: http://localhost/ita/ldp/resources/bugs/12 Link: <http://www.w3.org/ns/ldp#Resource>; rel='type' Content-Length: 0 Mihindukulasooriya, N., Esteban-Gutiérrez, M., García-Castro, R.: A Linked Data Platform adapter for the Bugzilla issue tracker. Demo at the 13th International Semantic Web Conference, Riva del Garda, Italy (Oct 2014)
Center for Open Middleware LDP4j in Use morph-LDP 19 • Exposes relational databases as read-write Linked Data Database + R2RML Morph-LDP Read-write LD Oegmembers Table id fname lname @prefix rr: <http://www.w3.org/ns/r2rml#> . @prefix foaf: <http://xmlns.com/foaf/0.1/> . <TriplesMapPerson> a rr:TriplesMap; rr:logicalTable [ rr:tableName "oegmembers" ]; asun Asunción Gómez Pérez fpriyatna Freddy Priyatna mesteban Miguel Estebam rr:subjectMap [ a rr:Subject; rr:class foaf:Person; rr:template “http://example.org/oeg/members/{id}"; rr:termType rr:IRI; ]; nmihindu Nandana Mihindukulas ocorcho Oscar Corcho rr:predicateObjectMap [ rr:predicateMap [ rr:constant foaf:firstName ]; rr:objectMap [ rr:column “fname"; rr:termType rr:Literal; ]; ]; rgarcia Raul Garcia Castro rr:predicateObjectMap [ rr:predicateMap [ rr:constant foaf:lastName ]; rr:objectMap [ rr:column “lname"; rr:termType rr:Literal; ]; ]; … http://example.org/oeg/members/fpriyatna Legacy Applications Registration Office exposes morph-LDP Web App Relational Database Library configures Tabulator ldspider LDIF OpenLink Data Explorer Freddy Priyatna dereferences to GET /oeg/members/ HTTP/1.1 Host: example.org Accept: text/turtle 200 OK HTTP/1.1 200 OK Content-Type: text/turtle; charset=UTF-8 Link: <http://www.w3.org/ns/ldp#BasicContainer>; rel="type" ETag: W/"195482449" @prefix dcterms: <http://purl.org/dc/terms/>. @prefix ldp: <http://www.w3.org/ns/ldp#>. <> a ldp:BasicContainer; dcterms:title "Members of OEG, UPM"; ldp:contains <http://example.org/oeg/members/asun> ; ldp:contains <http://example.org/oeg/members/fpriyatna> ; ldp:contains <http://example.org/oeg/members/mesteban>; ldp:contains <http://example.org/oeg/members/nmihindu>; ldp:contains <http://example.org/oeg/members/ocorcho> ; ldp:contains <http://example.org/oeg/members/rgarcia> . mappings Mihindukulasooriya, N., Priyatna, F., Corcho, O., Garcıa-Castro, R., Esteban- Gutiérrez, M.: morph-LDP: An R2RML-based Linked Data Platform implementation. Demo at the 11th Extended Semantic Web Conference, Crete, Greece (May 2014)
Center for Open Middleware Current status Supported LDP features • RDF Sources • Basic Containers • Direct Containers • Sever managed properties • Content preferences • Interaction models • LDP4j 1.0.0 to be released by the end of October: • Application API, • Application Engine, and • Server Frontend Unsupported LDP features • Non-RDF Sources • Put-to-Create LDP features under development • Indirect Containers 20 https://github.com/ldp4j/ldp4j
Center for Open Middleware Implementation report for LDP4j 21 • Results of W3C LDP test suite • https://dvcs.w3.org/hg/ldpwg/raw-file/default/tests/reports/ldp.html Feature MUST SHOULD MAY RDF Sources 24/24 (100.0%) 7/7 (100.0%) 1/1 (100.0%) Basic Containers 37/37 (100.0%) 15/17 (88.2%) 3/4 (75.0%) Direct Containers 42/42 (100.0%) 17/19 (89.5%) 3/4 (75.0%) Indirect Containers 36/39 (92.3%) 15/17 (88.2%) 3/4 (75.0%)
Center for Open Middleware Future work 22 • Support more LDP features: • Slug headers • Indirect containers • Paging* • Patch* • Other features beyond the LDP scope: • Vocabulary support • Content validation • Co-reference support • Transaction support • AAA support
Center for Open Middleware Questions? Miguel Esteban Gutiérrez, Nandana Mihindukulasooriya, Raúl García Castro

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LDP4j: A framework for the development of interoperable read-write Linked Data applications

  • 1. Center for Open Middleware LDP4j: A framework for the development of interoperable read-write Linked Data applications Miguel Esteban Gutiérrez, Nandana Mihindukulasooriya, Raúl García Castro Center for Open Middleware / Ontology Engineering Group Universidad Politécnica de Madrid, Spain. @nandanamihindu / [email protected]
  • 2. Center for Open Middleware Agenda 2 • Introduction • Developing a read-write Linked Data application • LDP4j to the rescue • LDP4j 101 • LDP4j in use • Current status • Future work
  • 3. Center for Open Middleware Introduction chocolate 3 • Linked Data Platform • a standard protocol for read-write Linked Data • LDP application ‘flavors’ • vanilla vs. chocolate (application-specific) • Interoperability LDP Resource (LDPR) Non-RDF Source (LDP-NR) RDF Source (LDP-NR) LDP Container (LDPC) Basic Container Direct Container Indirect Container vanilla LDP Clients Data model Business logic
  • 4. Center for Open Middleware Developing a read-write Linked Data Application What we have to consider 4 R+W LD Business Logic HTTP Syntax Routing Operation semantics Content negotiation Conditional requests • RFC 2616, 3986, 7230-7235 LDP RDF Sources Containers (Basic, direct, and indirect) Paging RDF transformation • LDP (and paging) 1.0 • RDF 1.1 • LD+JSON • RFC 3987, 5785, 5789, 5988, 6585, 7240 REST best practices Client-server Stateless Cacheable Layered system Uniform interface • Fielding, 2000; • Fielding & Taylor, 2002
  • 5. Center for Open Middleware Developing a read-write Linked Data Application What we can use up-to-now Servlet 3.0 JAX-RS 5 REST best practices HTTP LDP R+W LD Business Logic RDF Parsers/Serializers Third party apps and utilities that support LDP • LDP (and paging) 1.0 • RDF 1.1 • LD+JSON • RFC 3987, 5785, 5789, 5988, 6585, 7240 • Fielding, 2000; • Fielding & Taylor, 2002 • RFC 2616, 3986, 7230-7235 Syntax and routing No support at all Only for RDF-based data access
  • 6. Center for Open Middleware LDP4j to the rescue 6 • Java-based framework for the development of read-write Linked Data applications • Motto: Focus on your business logic, we will take care of the rest • License: Apache License, v2.0 • Features: • Simplified business object handling: • Lifting from and lowering to an intermediate representation that can be automatically unmarshalled from or marshalled to RDF, respectively. • LDP support • Protocol conversation control • Transparent metadata management • REST aware • Transparent publication of RDF URIRefs. • HTTP compliant • The framework takes care of fulfilling the requirements prescribed by the HTTP related RFCs (i.e., conditional requests processing, content negotiation, entity tag handling,…) www.ldp4j.org [email protected] https://github.com/ldp4j/ldp4j @LDP4j
  • 7. Center for Open Middleware LDP4j 101 High level architecture 7 Application API Application Engine Server Frontend Client Frontend R+W LD App. Consumer R+W LD App. Provider • LDP protocol handling • RDF transformation • Application management • Resource management • Endpoint management Server side HTTP handling • Templating annotations • Application configuration • Handler API • Handler extensibility APIs • Data manipulation API • State manipulation API Client side HTTP handling
  • 8. Center for Open Middleware LDP4j 101 Application model 8 Application Template Resource Endpoint Handler Session Snapshot publishes manipulates surrogateOf manages uses handledBy definesSemantics definesDeploymentPolicies Dataset exchanges provides
  • 9. Center for Open Middleware LDP4j 101 Application API 9 «describes» «annotation» Resource «describes» Application ResourceHandler Bootstrap Environment ContainerHandler DataSet Modifiable Deletable «uses» «uses» «produces» «uses» Individual Value Property Literal «extend» ContainerSnapshot ResourceSnapshot members «provides» «uses» ReadSession WriteSession AttachmentSnapshot «refersTo» ManagedIndividual LocalIndividual ExternalIndividual «represents» Configuration «uses» «uses» «annotation» BasicContainer «annotation» DirectContainer «annotation» IndirectContainer «describes» «describes» attachments «uses» «uses» «uses» «uses»
  • 10. Center for Open Middleware LDP4j 101 Execution Pipeline Dispatch request Preprocess request Op. Request Prepare Input data Op. Response Prepare response Create application session Dataset lowering RDF marshalling Execute business logic Terminate application session Enrich response data with LDP metadata Dataset Dataset Application Engine Server Frontend Client LDP4j Application 10 Handle resource lifecycle changes Handle endoint lifecycle changes LDP header generation Check LDP metadata consistency Remove LDP metadata Content negotiation handling Entity unmarshalling RDF lifting Conditional request handling LDP header analysis
  • 11. Center for Open Middleware LDP4j 101 Recipe for using LDP4j 11 1. Get LDP4j sources 2. Build LDP4j sources 3. Create a maven web-app project 4. Implement your business logic 5. Build the project 6. Deploy onto an servlet container 7. Enjoy!!!
  • 12. Center for Open Middleware LDP4j 101 Developing an application 12 • Create a maven web-app project: <?xml version="1.0" encoding="UTF-8"?> <project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd" xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"> <!-- Module coordinates here --> <packaging>war</packaging> <properties> <ldp4j.version>1.0.0-SNAPSHOT</ldp4j.version> <!-- Other properties here --> </properties> <dependencies> <dependency> <groupId>org.ldp4j.framework</groupId> <artifactId>ldp4j-application-api</artifactId> <version>${ldp4j.version}</version> </dependency> <dependency> <groupId>org.ldp4j.framework</groupId> <artifactId>ldp4j-server-core</artifactId> <scope>runtime</scope> <version>${ldp4j.version}</version> </dependency> <!-- Other dependencies here --> </dependencies> <!-- Other build setting here --> </project>
  • 13. Center for Open Middleware LDP4j 101 Developing an application 13 package org.example; import org.ldp4j.application.data.DataSet; import org.ldp4j.application.ext.Deletable; import org.ldp4j.application.ext.ResourceHandler; import org.ldp4j.application.session.ResourceSnapshot; import org.ldp4j.application.session.WriteSession; public class MyDeletableResourceHandler implements ResourceHandler, Deletable { @Override public DataSet get(ResourceSnapshot resource) { // TODO Implement your data retrieval logic return null; } @Override public void delete(ResourceSnapshot resource, WriteSession session) { // TODO Implement your deletion logic } } • Implement your resource handlers…
  • 14. Center for Open Middleware LDP4j 101 Developing an application 14 package org.example; import org.ldp4j.application.data.DataSet; import org.ldp4j.application.ext.ContainerHandler; import org.ldp4j.application.ext.ContentProcessingException; import org.ldp4j.application.ext.Modifiable; import org.ldp4j.application.session.ContainerSnapshot; import org.ldp4j.application.session.ResourceSnapshot; import org.ldp4j.application.session.WriteSession; public class MyModifiableContainerHandler implements ContainerHandler, Modifiable { @Override public DataSet get(ResourceSnapshot resource) { // TODO Implement your data retrieval logic return null; } @Override public ResourceSnapshot create(ContainerSnapshot container, DataSet representation, WriteSession session) { // TODO Implement your creation logic here return null; } @Override public void update(ResourceSnapshot resource, DataSet content, WriteSession session) throws ContentProcessingException { // TODO Implement your modification logic here } } • … and container handlers:
  • 15. Center for Open Middleware LDP4j 101 Developing an application 15 package org.example; ... import org.ldp4j.application.ext.annotations.BasicContainer; @BasicContainer( id = "containerTemplateId", memberHandler = MyDeletableResourceHandler.class ) public class MyModifiableContainerHandler implements ContainerHandler, Modifiable { ... } • Annotate the handlers: package org.example; ... import org.ldp4j.application.ext.annotations.Resource; @Resource( id="resourceTemplateId" ) public class MyDeletableResourceHandler implements ResourceHandler, Deletable { ... }
  • 16. Center for Open Middleware LDP4j 101 Developing an application 16 package org.example; import org.ldp4j.application.data.Name; import org.ldp4j.application.data.NamingScheme; import org.ldp4j.application.ext.Application; import org.ldp4j.application.ext.Configuration; import org.ldp4j.application.session.WriteSession; import org.ldp4j.application.setup.Bootstrap; import org.ldp4j.application.setup.Environment; public class MyApplication extends Application<Configuration> { @Override public void setup(Environment environment, Bootstrap<Configuration> bootstrap) { MyModifiableContainerHandler containerHandler=new MyModifiableContainerHandler(); MyDeletableResourceHandler resourceHandler=new MyDeletableResourceHandler(); // TODO Your handler configuration logic here bootstrap.addHandler(resourceHandler); bootstrap.addHandler(containerHandler); Name<?> rootContainerName=NamingScheme.getDefault().name("containerName") ; environment.publishResource(rootContainerName, MyModifiableContainerHandler.class, "containerRootPath"); } @Override public void initialize(WriteSession session) { // TODO Your handler initialization logic here // Remember, the session has to be updated to reflect the state of the data managed by the handlers } @Override public void shutdown() { // TODO Your shutdown logic here } } • Implement your application class:
  • 17. Center for Open Middleware LDP4j 101 Developing an application 17 • Update the web application descriptor: <?xml version="1.0" encoding="UTF-8"?> <web-app metadata-complete="false" version="3.0" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation=" http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"> <display-name>My LDP4j Application</display-name> <context-param> <param-name>ldp4jTargetApplication</param-name> <param-value>org.example.MyApplication</param-value> </context-param> <!-- Other configuration here --> </web-app>
  • 18. Center for Open Middleware LDP4j in Use The Bugzilla adapter 18 • Exposes Bugzilla as an LDP-enabled application ALM iStack ontology  RDF  HTTP Headers LDP Clients Bugzilla LDP Adapter  XML-RPC  Native data model An example of bug creation POST /ita/containers/bugs HTTP/1.1 Host: localhost Content-Type: text/turtle @prefix ai: <http://delicias.dia.fi.upm.es/ontologies/alm-istack#> . …rest of the namespace declarations are omitted for brevity. <> a ai:ClientDefect; dcterms:creator <http://localhost/ita/ldp/resources/users/9> ; dcterms:title "Bugzilla adapter build is broken"^^xsd:string; dcterms:description "Bugzilla adapter build fails due to a test failure"^^xsd:string; oslc_asset:relatedAsset <http://localhost/ita/ldp/resources/versions/16> ; ai:relatedIncident <https://bugzilla.mozilla.org/show_bug.cgi?id=730698> . HTTP/1.1 201 Created Location: http://localhost/ita/ldp/resources/bugs/12 Link: <http://www.w3.org/ns/ldp#Resource>; rel='type' Content-Length: 0 Mihindukulasooriya, N., Esteban-Gutiérrez, M., García-Castro, R.: A Linked Data Platform adapter for the Bugzilla issue tracker. Demo at the 13th International Semantic Web Conference, Riva del Garda, Italy (Oct 2014)
  • 19. Center for Open Middleware LDP4j in Use morph-LDP 19 • Exposes relational databases as read-write Linked Data Database + R2RML Morph-LDP Read-write LD Oegmembers Table id fname lname @prefix rr: <http://www.w3.org/ns/r2rml#> . @prefix foaf: <http://xmlns.com/foaf/0.1/> . <TriplesMapPerson> a rr:TriplesMap; rr:logicalTable [ rr:tableName "oegmembers" ]; asun Asunción Gómez Pérez fpriyatna Freddy Priyatna mesteban Miguel Estebam rr:subjectMap [ a rr:Subject; rr:class foaf:Person; rr:template “http://example.org/oeg/members/{id}"; rr:termType rr:IRI; ]; nmihindu Nandana Mihindukulas ocorcho Oscar Corcho rr:predicateObjectMap [ rr:predicateMap [ rr:constant foaf:firstName ]; rr:objectMap [ rr:column “fname"; rr:termType rr:Literal; ]; ]; rgarcia Raul Garcia Castro rr:predicateObjectMap [ rr:predicateMap [ rr:constant foaf:lastName ]; rr:objectMap [ rr:column “lname"; rr:termType rr:Literal; ]; ]; … http://example.org/oeg/members/fpriyatna Legacy Applications Registration Office exposes morph-LDP Web App Relational Database Library configures Tabulator ldspider LDIF OpenLink Data Explorer Freddy Priyatna dereferences to GET /oeg/members/ HTTP/1.1 Host: example.org Accept: text/turtle 200 OK HTTP/1.1 200 OK Content-Type: text/turtle; charset=UTF-8 Link: <http://www.w3.org/ns/ldp#BasicContainer>; rel="type" ETag: W/"195482449" @prefix dcterms: <http://purl.org/dc/terms/>. @prefix ldp: <http://www.w3.org/ns/ldp#>. <> a ldp:BasicContainer; dcterms:title "Members of OEG, UPM"; ldp:contains <http://example.org/oeg/members/asun> ; ldp:contains <http://example.org/oeg/members/fpriyatna> ; ldp:contains <http://example.org/oeg/members/mesteban>; ldp:contains <http://example.org/oeg/members/nmihindu>; ldp:contains <http://example.org/oeg/members/ocorcho> ; ldp:contains <http://example.org/oeg/members/rgarcia> . mappings Mihindukulasooriya, N., Priyatna, F., Corcho, O., Garcıa-Castro, R., Esteban- Gutiérrez, M.: morph-LDP: An R2RML-based Linked Data Platform implementation. Demo at the 11th Extended Semantic Web Conference, Crete, Greece (May 2014)
  • 20. Center for Open Middleware Current status Supported LDP features • RDF Sources • Basic Containers • Direct Containers • Sever managed properties • Content preferences • Interaction models • LDP4j 1.0.0 to be released by the end of October: • Application API, • Application Engine, and • Server Frontend Unsupported LDP features • Non-RDF Sources • Put-to-Create LDP features under development • Indirect Containers 20 https://github.com/ldp4j/ldp4j
  • 21. Center for Open Middleware Implementation report for LDP4j 21 • Results of W3C LDP test suite • https://dvcs.w3.org/hg/ldpwg/raw-file/default/tests/reports/ldp.html Feature MUST SHOULD MAY RDF Sources 24/24 (100.0%) 7/7 (100.0%) 1/1 (100.0%) Basic Containers 37/37 (100.0%) 15/17 (88.2%) 3/4 (75.0%) Direct Containers 42/42 (100.0%) 17/19 (89.5%) 3/4 (75.0%) Indirect Containers 36/39 (92.3%) 15/17 (88.2%) 3/4 (75.0%)
  • 22. Center for Open Middleware Future work 22 • Support more LDP features: • Slug headers • Indirect containers • Paging* • Patch* • Other features beyond the LDP scope: • Vocabulary support • Content validation • Co-reference support • Transaction support • AAA support
  • 23. Center for Open Middleware Questions? Miguel Esteban Gutiérrez, Nandana Mihindukulasooriya, Raúl García Castro

Editor's Notes

  • #5: Start from scratch: need to deal with HTTP, REST, and LDP specifications, and develop your application meeting their respective requirements (which can be confusing, ambiguous, or contradictory) Reuse third party solutions: Avalability, compliance level, maturity, ‘quality’, purpose,… Big players: Callimachus: end-user CMS-alike solution Eclipse LyO: OSLC-oriented library (perfect fit for developing OSLC domain specific applications) Apache Marmotta: RDF store with LDP support that provides CMS alike features. Virtuoso: RDF Store with LDP support that provides advanced semantic web feat ldphp / gold
  • #6: Start from scratch: need to deal with HTTP, REST, and LDP specifications, and develop your application meeting their respective requirements (which can be confusing, ambiguous, or contradictory) Reuse third party solutions: Avalability, compliance level, maturity, ‘quality’, purpose,… Big players: Callimachus: end-user CMS-alike solution Eclipse LyO: OSLC-oriented library (perfect fit for developing OSLC domain specific applications) Apache Marmotta: RDF store with LDP support that provides CMS alike features. Virtuoso: RDF Store with LDP support that provides advanced semantic web feat ldphp / gold