An Introduction to Linked Data and Microdata

An Introduction to Linked Dataand Microdata

Today We’re Linking Data!● If something is identified, it can be linked

to, shared, talked about...● Lets make items from our collections

linkable to items from other collections!

NYTimesVIAF

DBPediaYOUR DATA

Archive.org

GeoNames

The goal of Linked Data is to enable people to share structured (information) on the Web as easily as they share documents today.Bizer/Cyganiak/Heath Linked Data Tutorial, linkeddata.orgAdrian Stevensen, UK Web Archives

Linked Data Design Issues

● URIs● LD Design Issues● Triples

http://www.w3.org/DesignIssues/LinkedData.html

“The Graph” as an Organizational Data Model

Linked Data includes a paradigm shift from the relational or hierarchical means of modelling data to a graph based model…

Resource Description Format (RDF)● RDF = defined statements comprising a

subject, a predicate (property), and an object. These statements are called “Triples”.

Triples for Humans● Triples are statements that describe

relationships or links between things○

News Articles The New York

Timesdc:publisherIs a Publisher of

The Dave Matthews

Band

Dave Matthews

(foaf:member) Is Member of

Triples for Machines

Triples can be serialized in many different ways including

● Resource Description Format ● RDF/XML ● RDFa ● N3 ● Turtle

● etc. but they all describe things in the <subject><predicate><object> format

Description Formats must be consistent and predictable for machines to be able to interpret the information

Assigning Meaning to Your DataRDF doesn't offer any means to record semantics or meaning.LOD vocabularies and ontologies provide a framework for determining how we organize information and how we agree on predicates…

● RDF Schema (RDFS)● Ontologies: FOAF, VIAF, OWL (Web Ontology Language), etc.● Schema.org/Microdata/RDFa 1.1

Machine Access/Querying Your DataSPARQL –provides a formal language with which to ask meaning-driven questions of RDF data sets

Attribution and CC License ● Sections of this presentation adapted from materials

created by other participants in the LOD-LAM Community

● This presentation available under creative commons Non Commercial-Share Alike:

http://creativecommons.org/licenses/by-nc/2.0/