In this presentation, we describe the underlying principles of the Semantic Web along with the core concepts and technologies, how they fit in with the Grails Framework and any existing tools, API\'s and Implementations.

1. Grails and the Semantic Web
19/09/2011

2. Common Misconceptions
• Is bleeding edge and still experimental
• Has been around a while and isn’t working
• Has a high learning curve and adoption cost
• Is all about unstructured content, nlp and SEO
• Semantic Web data integration is all about
query federation (EII) and never about
warehousing/ETL

3. Use Cases
• Query federation
• Linking data
• Inferring new data
• Data management

4. Core Concepts
• HTTP / URI’s
• RDF
• RDFS, OWL etc.
• SPARQL
• RDFa

5. RDF
• Triples or quads
• N3/Turtle, XML, RDFj (JSON)
@prefix gr: <http://purl.org/goodrelations/v1#> .
@prefix foaf: <http://xmlns.com/foaf/0.1/> .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>.
@prefix dc: <http://purl.org/dc/elements/1.1/>.
@prefix innovation: <http://purl.org/innovation/ns#>.
@prefix ex: <http://www.example.com/>.
@prefix dbpedia: <http://dbpedia.org/resource/>.
@prefix ncicb: <http://ncicb.nci.nih.gov/xml/owl/EVS/Thesaurus.owl#>.
ex:glucose-monitor dc:title "Non invasive testing of blood glucose levels";
innovation:embodiedBy ex:lein-2000;
innovation:hasImprovement <uuid:aaaaaaaa>.
ex:lein-2000 dc:title "The Lein 2000 blood glucose meter";
rdf:type gr:ProductOrServiceModel;
rdf:type innovation:Embodiment;
rdf:type ncicb:Diagnostic_Therapeutic_and_Research_Equipment;
innovation:hasUsage <uuid:bbbbbbbb>.
<uuid:bbbbbbbb> innovation:usedBy dbpedia:Physician;
innovation:usedOn ex:Diabetics.
<uuid:aaaaaaaa> innovation:improvesEffectivenessOf dbpedia:Medical_Test

6. SPARQL
• SPARQL 1.1 Query
• SPARQL 1.1 Update
• SPARQL 1.1 Protocol for RDF
• SPARQL 1.1 Graph Store HTTP Protocol
• SPARQL 1.1 Entailment Regimes
• SPARQL 1.1 Service Description
• SPARQL 1.1 Federation Extensions

7. Alignment with Grails
GORM RDF
RDFS
SPARQL
GSP’s RDFa

8. Tools / API’s / Plugins
• Jena/Sesame
• Groovy SPARQL
• RDFa Plugin
• Triplestores

9. Jena / Sesame
• RDF/RDFS/OWL Libraries
• Ontology + Reasoning
• SPARQL libraries
• Development level triplestores

10. Groovy SPARQL
• Fluent DSL, leveraging Groovy 1.8 features
• Pure Java "Templates" for Jena/SPARQL similar
to JdbcTemplate/jmsTemplate in Spring
• Object marshalling and GORM / Spring Data
support
• Sparql / RDF Builder
• Grails plug-in

11. RDFa Plugin

12. Triple Stores
• 4Store
• Virtuoso
– Native JDBC Driver
• Stardog
– DataSouce and DataSourceFactoryBean for managing
Stardog connections
– SnarlTemplate for transaction- and connection-pool
safe Stardog programming
– DataImporter for easy bootstrapping of input data
into Stardog

13. Known Issues
• Support for SPARQL 1.1
• Reasoning
• Compliance