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The Semantic Web for Genealolgy
 

The Semantic Web for Genealolgy

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This presentation starts with an introduction to the Semantic Web and then moves on to discuss a project of mine involving using the Semantic Web for Genealogy. ...

This presentation starts with an introduction to the Semantic Web and then moves on to discuss a project of mine involving using the Semantic Web for Genealogy.

The presentation discusses various "vocabularies" that are used to represent topics specific to genealogy.

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    The Semantic Web for Genealolgy The Semantic Web for Genealolgy Presentation Transcript

    • A Description of the Project IdeaPresented by Bruce Whealton: Future WaveDesigns: http://FutureWaveDesigns.com 1
    • What is the Semantic Web andReasons for use in Genealogy Encourages linked data – information sharing Simple database model Information is not trapped in a single application but it shared globally. Contributing to the Semantic Web increases the usefulness for everyone (there’s more value when more people use it). Common vocabularies exist for describing relationships within and between the data(information) Presented by Bruce Whealton: Future Wave Designs: http://FutureWaveDesigns.com 2
    • First we need to understand what is meant by the Semantic Webbefore we can discuss the application Presented by Bruce Whealton: Future Wave Designs: http://FutureWaveDesigns.com 3
    • Syntax Versus Semantics Syntax is like the rules of grammar, and how we order our words… or in terms of computers it deals with the format and structure of commands or how we give commands to a computer. Semantics deals with meaning. Presented by Bruce Whealton: Future Wave Designs: http://FutureWaveDesigns.com 4
    • Representing Meaning RDF: Resource Descriptive Framework  Everything is a resource  Data/Information/Knowledge is represented as triples: Subject – Predicate – Object  RDF is also a file format. An example that will be presented below is a foaf file: foaf.rdf Presented by Bruce Whealton: Future Wave Designs: http://FutureWaveDesigns.com 5
    • Meaning represented as triples Bruce knows Jean Person1 first_name Bruce Person1 last_name Whealton Similar to saying Person1 hasFirstName (has a first name of) Bruce Presented by Bruce Whealton: Future Wave Designs: http://FutureWaveDesigns.com 6
    • Address book Graph P1 Knows Jean First name Bruce Presented by Bruce Whealton: Future Wave Designs: http://FutureWaveDesigns.com 7
    • FOAF – Friend of a Friend A Semantic Web Vocabulary used to describe people, their activities and their relationships to one another. It is becoming very popular for people who discover this to setup and have their own FOAF profile. This vocabulary is the base from which other vocabularies are extended. So, what is a vocabulary in this context? Presented by Bruce Whealton: Future Wave Designs: http://FutureWaveDesigns.com 8
    • Semantic Web Vocabularies andOntologies For the Semantic Web we deal with controlled vocabularies, which define terms and how they relate to each other. We have a hierarchy of Classes which each have properties. This is where you get the triples which relate the classes to the values of these properties. Let’s take some examples… Presented by Bruce Whealton: Future Wave Designs: http://FutureWaveDesigns.com 9
    •  A Person “has name” “Bruce Whealton” Person is a class and “has name” is the predicate with “Bruce Whealton” being the value Presented by Bruce Whealton: Future Wave Designs: http://FutureWaveDesigns.com 10
    •  We use a vocabulary to describe concepts that relate to a specific domain, or an area of knowledge… or simply toa set of concepts. Different fields and professions have their own vocabulary. We need to define how the terms we want to use relate to one another. This is how we express meaning on the semantic web; And form Semantic Web databases – aka Triple Stores Presented by Bruce Whealton: Future Wave Designs: http://FutureWaveDesigns.com 11
    •  FOAF concepts are prefixed with the letters foaf. Examples: foaf:Person is a class which describes a person. foaf:name is a property foaf:Person foaf:name “Bruce Whealton” A triple Much more can be represented with this vocabulary, such as chat ids, web pages, weblogs; One of the most important things is who you know. Presented by Bruce Whealton: Future Wave Designs: http://FutureWaveDesigns.com 12
    •  Using this property web crawlers can discover foaf profiles by crawling from one profile to the next. Each foaf profile will have links to the people that one knows along with links to web pages that describe those people, e.g. their foaf profile. Web crawlers follow those links… You build your network through the links within your foaf profile and the links to you in other profiles. Your foaf profile is stored in a file, typically, in RDF format which was described earlier in this presentation, i.e. foaf.rdf Presented by Bruce Whealton: Future Wave Designs: http://FutureWaveDesigns.com 13
    • Vocabulary = Ontology Presented by Bruce Whealton: Future Wave Designs: http://FutureWaveDesigns.com 14
    • The approach taken is to describe a persons life as a series of interconnected key events,around which other information can be woven. Presented by Bruce Whealton: Future Wave Designs: http://FutureWaveDesigns.com 15
    •  All terms in this vocabulary are prefixed with “bio:” bio:Birth – includes date, parents, location bio:Marriage – includes date, location, names of persons These are classes that represent Events bio:Graduation – an event relating to graduation from some school or studies bio:Death – includes date, place and bio:principal (meaning the person who’s death is represented) Presented by Bruce Whealton: Future Wave Designs: http://FutureWaveDesigns.com 16
    •  Properties  bio:olb – one line bio  bio:biography – can be several paragraphs or a reference to a document.  bio:keywords – key words to describe a person. Presented by Bruce Whealton: Future Wave Designs: http://FutureWaveDesigns.com 17
    •  Terms in this vocabulary begin with “rel:” rel:ancestorOf – self-explanatory rel:descendantOf – opposite of rel:ancestorOf Note: same person cannot be both of above Also note, each property is a property of a foaf:Person Example: PersonA rel:ancestorOf PersonB Above is an example of a triple, explicitly stated information. Presented by Bruce Whealton: Future Wave Designs: http://FutureWaveDesigns.com 18
    •  rel:spouseOf – symmetrical property because ifPersonA rel:spouseOf PersonB thenPersonB rel:SpouseOf personA rel:siblingOf – symmetrical for same reason rel:parentOf – not symmetrical property (person cannot be parent of another person and have that person be their parent also). rel:childOf – if PersonA rel:parentOf PersonB thenPersonB rel:childOf PersonA Presented by Bruce Whealton: Future Wave Designs: http://FutureWaveDesigns.com 19
    •  Rel:GrandchildOf Rel:GrandparentOf Various other properties that relate one person to another person Presented by Bruce Whealton: Future Wave Designs: http://FutureWaveDesigns.com 20