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Friend Of A Friend


General

  • Ontologically Committed

    Generic
  • Categorical

    No

Vertical

  • Parent-arity Type Instance

    Unconstrained
  • Transitivity

    Yes
  • Boundedness Type Instance - Downward

    Bounded
  • Boundedness Type Instance - Fixed Finite Levels

    Not yet assessed
  • Boundedness Type Instance - Number of Fixed Levels

    Not yet assessed
  • Stratification Type Instance

    Not yet assessed
  • Formal Generation - Whole Part - Fusion

    Not yet assessed
  • Formal Generation - Whole Part - Complement

    Not yet assessed
  • Formal Generation - Type Instance - Fusion

    Not yet assessed
  • Formal Generation - Super Sub Type - Fusion

    Not yet assessed
  • Formal Generation - Super Sub Type - Complement

    Not yet assessed
  • Relation Class-ness Type Instance

    Second-class
  • Relation Class-ness Super Sub Type

    Second-class

Horizontal

  • Spacetime

    Not yet assessed
  • Locations

    Not yet assessed
  • Properties

    Not yet assessed
  • Endurants

    Not yet assessed
  • Immaterial

    Not yet assessed

Universal

  • Merelogy

    No
  • Interpenetration

    Not yet assessed
  • Materialism

    Not yet assessed
  • Possibilia

    Not yet assessed
  • Criteria Of Identity

    Not yet assessed
  • Time

    Not yet assessed
  • Indexicals: Here And Now

    Not yet assessed
  • Higher-arity

    Not yet assessed

Friend Of A Friend - FOAF 

  1. Overview 

FOAF (an acronym of Friend Of A Friend) is a machine-readable ontology describing persons, their activities and their relations to other people and objects. 

  1. Top-level 

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  1. Key characteristics 

 A generic ontology with a focus on online people.  

  1. Relevant extracts 

 

FOAF describes the world using simple ideas inspired by the Web. In FOAF descriptions, there are only various kinds of things and links, which we call properties. The types of the things we talk about in FOAF are called classes. FOAF is therefore defined as a dictionary of terms, each of which is either a class or a property. Other projects alongside FOAF provide other sets of classes and properties, many of which are linked with those defined in FOAF. 

Description: this ontology is used to describe people and social relationship on the Web. It is mostly focused on people's existence in the virtual world, with many properties related to online activity or identity: foaf:mbox, foaf:skypeID, foaf:msnID, foaf:geekcode, etc. Nothing about family relations, physical address... It provides similar information on organisations or groups with a similar focus on their existence on the Web (work place webpage, etc). It is particularly well suited for describing people on Web-based Social platforms (facebook, twitter, blogspot, ...). 

Which datasets use it: FOAF is used on many different websites. The list would be too long for this page. Notable examples are: Live Journal, etc. Many computer scientists in the Semantic Web field all over the world are publishing their personal FOAF file. 

Tools supporting it: FOAF-a-Matic is a Web-based app which allows the user to create a FOAF file quickly by entering natural language text information in a Web form. The Wiki of the FOAF project has a webpage listing many FOAF-related tools. 

Technicalities: FOAF is a rather small ontology (19 classes, 44 object properties, 27 datatype properties). It is not an OWL 2 DL ontology because it relies on inverse functional datatype properties. However, apart from this small issue and minor syntactical issues, the ontology is essentially compatible with OWL 2 RL, which means it is particularly suitable for materialising implicit knowledge about FOAF data in a triple store. 


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