RELATIONSHIP: A vocabulary for describing relationships between people

This Version
http://purl.org/vocab/relationship/rel-vocab-20040308 [HTML] [RDF]
Latest Version
http://purl.org/vocab/relationship
Previous Version
http://www.perceive.net/schemas/relationship/
Contributors
Ian Davis
Eric Vitiello Jr

Table of Contents

Introduction

A vocabulary for describing relationships between people

Changes From Previous Version

Added the following properties: lostContactWith, knowsOf, wouldLikeToKnow , knowsInPassing, knowsByReputation, closeFriendOf, hasMet, worksWith, colleagueOf , collaboratesWith, employerOf, employedBy, mentorOf, apprenticeTo, livesWith, neighborOf , grandparentOf, lifePartnerOf, engagedTo, ancestorOf, descendantOf, participantIn, participant

Namespace

The preferred namespace URI for this vocabulary is http://purl.org/vocab/relationship and the preferred prefix is rel

Vocabulary Properties

friendOf

URI
http://purl.org/vocab/relationship/friendOf
Label
Friend Of
Definition
A person who shares mutual friendship with this person.
Sub Property Of
knows (http://xmlns.com/foaf/0.1/knows)
Domain
Person (http://xmlns.com/foaf/0.1/Person)
Range
Person (http://xmlns.com/foaf/0.1/Person)
Same As
http://www.perceive.net/schemas/relationship/friendOf

acquaintanceOf

URI
http://purl.org/vocab/relationship/acquaintanceOf
Label
Acquaintance Of
Definition
A person having more than slight or superficial knowledge of this person but short of friendship.
Sub Property Of
knows (http://xmlns.com/foaf/0.1/knows)
Domain
Person (http://xmlns.com/foaf/0.1/Person)
Range
Person (http://xmlns.com/foaf/0.1/Person)
Same As
http://www.perceive.net/schemas/relationship/acquaintanceOf

parentOf

URI
http://purl.org/vocab/relationship/parentOf
Label
Parent Of
Definition
A person who has given birth to or nurtured and raised this person.
Sub Property Of
knows (http://xmlns.com/foaf/0.1/knows)
Domain
Person (http://xmlns.com/foaf/0.1/Person)
Range
Person (http://xmlns.com/foaf/0.1/Person)
Same As
http://www.perceive.net/schemas/relationship/parentOf

siblingOf

URI
http://purl.org/vocab/relationship/siblingOf
Label
Sibling Of
Definition
A person having one or both parents in common with this person.
Sub Property Of
knows (http://xmlns.com/foaf/0.1/knows)
Domain
Person (http://xmlns.com/foaf/0.1/Person)
Range
Person (http://xmlns.com/foaf/0.1/Person)
Same As
http://www.perceive.net/schemas/relationship/siblingOf

childOf

URI
http://purl.org/vocab/relationship/childOf
Label
Child Of
Definition
A person who was given birth to or nurtured and raised by this person.
Sub Property Of
knows (http://xmlns.com/foaf/0.1/knows)
Domain
Person (http://xmlns.com/foaf/0.1/Person)
Range
Person (http://xmlns.com/foaf/0.1/Person)
Same As
http://www.perceive.net/schemas/relationship/childOf

grandchildOf

URI
http://purl.org/vocab/relationship/grandchildOf
Label
Grandchild Of
Definition
A person who is a child of any of this person's children.
Sub Property Of
knows (http://xmlns.com/foaf/0.1/knows)
Domain
Person (http://xmlns.com/foaf/0.1/Person)
Range
Person (http://xmlns.com/foaf/0.1/Person)
Same As
http://www.perceive.net/schemas/relationship/grandchildOf

spouseOf

URI
http://purl.org/vocab/relationship/spouseOf
Label
Spouse Of
Definition
A person who is married to this person.
Sub Property Of
knows (http://xmlns.com/foaf/0.1/knows)
Domain
Person (http://xmlns.com/foaf/0.1/Person)
Range
Person (http://xmlns.com/foaf/0.1/Person)
Same As
http://www.perceive.net/schemas/relationship/spouseOf

enemyOf

URI
http://purl.org/vocab/relationship/enemyOf
Label
Enemy Of
Definition
A person towards whom this person feels hatred, intends injury to, or opposes the interests of.
Sub Property Of
knows (http://xmlns.com/foaf/0.1/knows)
Domain
Person (http://xmlns.com/foaf/0.1/Person)
Range
Person (http://xmlns.com/foaf/0.1/Person)
Same As
http://www.perceive.net/schemas/relationship/enemyOf

antagonistOf

URI
http://purl.org/vocab/relationship/antagonistOf
Label
Antagonist Of
Definition
A person who opposes and contends against this person.
Sub Property Of
knows (http://xmlns.com/foaf/0.1/knows)
Domain
Person (http://xmlns.com/foaf/0.1/Person)
Range
Person (http://xmlns.com/foaf/0.1/Person)
Same As
http://www.perceive.net/schemas/relationship/antagonistOf

ambivalentOf

URI
http://purl.org/vocab/relationship/ambivalentOf
Label
Ambivalent Of
Definition
A person towards whom this person has mixed feelings or emotions.
Sub Property Of
knows (http://xmlns.com/foaf/0.1/knows)
Domain
Person (http://xmlns.com/foaf/0.1/Person)
Range
Person (http://xmlns.com/foaf/0.1/Person)
Same As
http://www.perceive.net/schemas/relationship/ambivalentOf

lostContactWith

URI
http://purl.org/vocab/relationship/lostContactWith
Label
Lost Contact With
Definition
A person who was once known by this person but has subsequently become uncontactable.
Sub Property Of
knows (http://xmlns.com/foaf/0.1/knows)
Domain
Person (http://xmlns.com/foaf/0.1/Person)
Range
Person (http://xmlns.com/foaf/0.1/Person)

knowsOf

URI
http://purl.org/vocab/relationship/knowsOf
Label
Knows Of
Definition
A person who has come to be known to this person through their actions or position.
Sub Property Of
knows (http://xmlns.com/foaf/0.1/knows)
Domain
Person (http://xmlns.com/foaf/0.1/Person)
Range
Person (http://xmlns.com/foaf/0.1/Person)

wouldLikeToKnow

URI
http://purl.org/vocab/relationship/wouldLikeToKnow
Label
Would Like to Know
Definition
A person whom this person would desire to know more closely.
Sub Property Of
knows (http://xmlns.com/foaf/0.1/knows)
Domain
Person (http://xmlns.com/foaf/0.1/Person)
Range
Person (http://xmlns.com/foaf/0.1/Person)

knowsInPassing

URI
http://purl.org/vocab/relationship/knowsInPassing
Label
Knows In Passing
Definition
A person whom this person has slight or superficial knowledge of.
Sub Property Of
knows (http://xmlns.com/foaf/0.1/knows)
Domain
Person (http://xmlns.com/foaf/0.1/Person)
Range
Person (http://xmlns.com/foaf/0.1/Person)

knowsByReputation

URI
http://purl.org/vocab/relationship/knowsByReputation
Label
Knows By Reputation
Definition
A person known by this person primarily for a particular action, position or field of endeavour.
Sub Property Of
knows (http://xmlns.com/foaf/0.1/knows)
Domain
Person (http://xmlns.com/foaf/0.1/Person)
Range
Person (http://xmlns.com/foaf/0.1/Person)

closeFriendOf

URI
http://purl.org/vocab/relationship/closeFriendOf
Label
Close Friend Of
Definition
A person who shares a close mutual friendship with this person.
Sub Property Of
knows (http://xmlns.com/foaf/0.1/knows)
Domain
Person (http://xmlns.com/foaf/0.1/Person)
Range
Person (http://xmlns.com/foaf/0.1/Person)

hasMet

URI
http://purl.org/vocab/relationship/hasMet
Label
Has Met
Definition
A person who has met this person whether in passing or longer.
Sub Property Of
knows (http://xmlns.com/foaf/0.1/knows)
Domain
Person (http://xmlns.com/foaf/0.1/Person)
Range
Person (http://xmlns.com/foaf/0.1/Person)

worksWith

URI
http://purl.org/vocab/relationship/worksWith
Label
Works With
Definition
A person who works for the same employer as this person.
Sub Property Of
knows (http://xmlns.com/foaf/0.1/knows)
Domain
Person (http://xmlns.com/foaf/0.1/Person)
Range
Person (http://xmlns.com/foaf/0.1/Person)

colleagueOf

URI
http://purl.org/vocab/relationship/colleagueOf
Label
Colleague Of
Definition
A person who is a member of the same profession as this person.
Sub Property Of
knows (http://xmlns.com/foaf/0.1/knows)
Domain
Person (http://xmlns.com/foaf/0.1/Person)
Range
Person (http://xmlns.com/foaf/0.1/Person)

collaboratesWith

URI
http://purl.org/vocab/relationship/collaboratesWith
Label
Collaborates With
Definition
A person who works towards a common goal with this person.
Sub Property Of
knows (http://xmlns.com/foaf/0.1/knows)
Domain
Person (http://xmlns.com/foaf/0.1/Person)
Range
Person (http://xmlns.com/foaf/0.1/Person)

employerOf

URI
http://purl.org/vocab/relationship/employerOf
Label
Employer Of
Definition
A person who engages the services of this person.
Sub Property Of
knows (http://xmlns.com/foaf/0.1/knows)
Domain
Person (http://xmlns.com/foaf/0.1/Person)
Range
Person (http://xmlns.com/foaf/0.1/Person)

employedBy

URI
http://purl.org/vocab/relationship/employedBy
Label
Employed By
Definition
A person for whom this person's services have been engaged.
Sub Property Of
knows (http://xmlns.com/foaf/0.1/knows)
Domain
Person (http://xmlns.com/foaf/0.1/Person)
Range
Person (http://xmlns.com/foaf/0.1/Person)

mentorOf

URI
http://purl.org/vocab/relationship/mentorOf
Label
Mentor Of
Definition
A person who serves as a trusted counselor or teacher to this person.
Sub Property Of
knows (http://xmlns.com/foaf/0.1/knows)
Domain
Person (http://xmlns.com/foaf/0.1/Person)
Range
Person (http://xmlns.com/foaf/0.1/Person)

apprenticeTo

URI
http://purl.org/vocab/relationship/apprenticeTo
Label
Apprentice To
Definition
A person to whom this person serves as a trusted counselor or teacher.
Sub Property Of
knows (http://xmlns.com/foaf/0.1/knows)
Domain
Person (http://xmlns.com/foaf/0.1/Person)
Range
Person (http://xmlns.com/foaf/0.1/Person)

livesWith

URI
http://purl.org/vocab/relationship/livesWith
Label
Lives With
Definition
A person who shares a residence with this person.
Sub Property Of
knows (http://xmlns.com/foaf/0.1/knows)
Domain
Person (http://xmlns.com/foaf/0.1/Person)
Range
Person (http://xmlns.com/foaf/0.1/Person)

neighborOf

URI
http://purl.org/vocab/relationship/neighborOf
Label
Neighbor Of
Definition
A person who lives in the same locality as this person.
Sub Property Of
knows (http://xmlns.com/foaf/0.1/knows)
Domain
Person (http://xmlns.com/foaf/0.1/Person)
Range
Person (http://xmlns.com/foaf/0.1/Person)

grandparentOf

URI
http://purl.org/vocab/relationship/grandparentOf
Label
Grandparent Of
Definition
A person who is the parent of any of this person's parents.
Sub Property Of
knows (http://xmlns.com/foaf/0.1/knows)
Domain
Person (http://xmlns.com/foaf/0.1/Person)
Range
Person (http://xmlns.com/foaf/0.1/Person)

lifePartnerOf

URI
http://purl.org/vocab/relationship/lifePartnerOf
Label
Life Partner Of
Definition
A person who has made a long-term commitment to this person's.
Sub Property Of
knows (http://xmlns.com/foaf/0.1/knows)
Domain
Person (http://xmlns.com/foaf/0.1/Person)
Range
Person (http://xmlns.com/foaf/0.1/Person)

engagedTo

URI
http://purl.org/vocab/relationship/engagedTo
Label
Engaged To
Definition
A person to whom this person is betrothed.
Sub Property Of
knows (http://xmlns.com/foaf/0.1/knows)
Domain
Person (http://xmlns.com/foaf/0.1/Person)
Range
Person (http://xmlns.com/foaf/0.1/Person)

ancestorOf

URI
http://purl.org/vocab/relationship/ancestorOf
Label
Ancestor Of
Definition
A person who is a descendant of this person.
Sub Property Of
knows (http://xmlns.com/foaf/0.1/knows)
Domain
Person (http://xmlns.com/foaf/0.1/Person)
Range
Person (http://xmlns.com/foaf/0.1/Person)

descendantOf

URI
http://purl.org/vocab/relationship/descendantOf
Label
Descendant Of
Definition
A person from whom this person is descended.
Sub Property Of
knows (http://xmlns.com/foaf/0.1/knows)
Domain
Person (http://xmlns.com/foaf/0.1/Person)
Range
Person (http://xmlns.com/foaf/0.1/Person)

participantIn

URI
http://purl.org/vocab/relationship/participantIn
Label
Participant In
Sub Property Of
knows (http://xmlns.com/foaf/0.1/knows)
Domain
Person (http://xmlns.com/foaf/0.1/Person)
Range
http://purl.org/vocab/relationship/Relationship

participant

URI
http://purl.org/vocab/relationship/participant
Label
Participant
Sub Property Of
knows (http://xmlns.com/foaf/0.1/knows)
Domain
http://purl.org/vocab/relationship/Relationship
Range
Person (http://xmlns.com/foaf/0.1/Person)

Vocabulary Classes

Relationship

URI
http://purl.org/vocab/relationship/Relationship
Label
Relationship
Definition
A particular type of connection existing between people related to or having dealings with each other.

Examples

Using With FOAF

The RELATIONSHIP vocabulary can be used without modification with FOAF documents. Simply replace foaf:knows properties with a more specific property from this vocabulary. For backwards compatibility with older, non-RDF aware, tools, you may want to keep the foaf:knows property as well.

  
<rdf:RDF
      xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
      xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#"
      xmlns:foaf="http://xmlns.com/foaf/0.1/"
      xmlns:rel="http://purl.org/vocab/relationship/"
      >

  <foaf:Person rdf:nodeID="ian">
    <foaf:name>Ian Davis</foaf:name>
    <foaf:title>Mr</foaf:title>
    <foaf:firstName>Ian</foaf:firstName>
    <foaf:surname>Davis</foaf:surname>

    <rel:hasMet>
      <foaf:Person>
        <foaf:name>William Tell</foaf:name>
      </foaf:Person>
    </rel:hasMet>

    <rel:collaboratesWith rdf:nodeID="eric"/>
  </foaf:Person>
	
  <foaf:Person rdf:nodeID="eric">
    <foaf:nick>pixel</foaf:nick>
  </foaf:Person>



</rdf:RDF>

Using With HTML and XHTML

The relationship vocabulary can be used to describe relationships with the people linked from a web page. This is particularly useful for blogrolls or contact lists but can be used with any type of link. The HTML a element provides two attributes, rel and rev, that can be used to specify the relationship. Both rel and rev take a space separated list of keywords as their value. To use a term from the relationship vocabulary just drop the http://purl.org/vocab/relationship/ namespace to leave the property name, e.g. http://purl.org/vocab/relationship/worksWith would become worksWith which can be added as the value of rel or rev.

rel

The rel attribute specifies a relationship that the author of the linked page has with the author of the linking page. For example: 

<a href="http://example.com/boats" rel="childOf">The boat we restored"</a>

This link states that the author of http://example.com/boats is a child of the author of the html above.

rev

The rev attribute specifies a relationship that the author of the linking page has with the author of the linked page. The example here is: 

<a href="http://example.com/boats" rev="childOf">The boat we restored"</a>

In this case the meaning of the link is reversed: the author of the html above is a child of the author of http://example.com/boats.

The HTML and XHTML recommendations require an HTML document to declare a custom profile if it uses any non-standard rel or rev types. This is done by adding a profile attribute with a value of http://purl.org/vocab/relationship/ to the document's head element. 

  <head profile="http://purl.org/vocab/relationship/">
    <title>People I Know</title>
  </head>

Complete Example

  <html>
    <head profile="http://purl.org/vocab/relationship/">
      <title>People I Know</title>
    </head>
    <body>
      <p>Here are the people I know:</p>
        <ul>
          <li><a href="http://example.com/~freddy" rel="closeFriendOf">Freddy (he's cool!)</a></li>
          <li><a href="http://frooble.com/" rel="mentorOf">Jimbo</a></li>
          <li><a href="http://mmmm.com/klm" rel="friendOf">Katie</a></li>
          <li><a href="http://example.com/~omah" rel="worksWith">Omah (coderman)</a></li>
          <li><a href="http://example.com/~jason" rev="closeFriendOf employedBy">Jason, da boss</a></li>
        </ul>
      </body>
    </html>

RDF Interpretation

Custom parsers that extract RDF from (X)HTML can use the relationships expressed in the links to infer the equivilent RDF triples. It should be remembered that the relationship is between the authors of the pages not between the pages themselves. Given the following link on a document at http://example.com/mypage.html: 

<a href="http://example.com/boats" rel="childOf">The boat we restored"</a>

a suggested RDF extraction is:

  <foaf:Person>
    <foaf:maker rdf:resource="http://example.com/boats"/>
    <rel:childOf>
      <foaf:Person>
        <foaf:maker rdf:resource="http://example.com/mypage.html"/>
      </foaf:Person>
    </rel:childOf>
  </foaf:Person>

RDF Schema

The schema included here is informational only. The normative schema can be found at http://purl.org/vocab/relationship/rel-vocab-20040308.rdf

<rdf:RDF
   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
   xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#"
   xmlns:foaf="http://xmlns.com/foaf/0.1/"
   xmlns:wot="http://xmlns.com/wot/0.1/"
   xmlns:dc="http://purl.org/dc/elements/1.1/"
   xmlns:dcterm="http://purl.org/dc/terms/"
   xmlns:owl="http://www.w3.org/2002/07/owl#"
   xmlns:vann="http://purl.org/vocab/vann/">
  
  <rdf:Description rdf:about="">
    <dc:contributor>Ian Davis</dc:contributor>
    <dc:contributor>Eric Vitiello Jr</dc:contributor>
    <dc:title>
      RELATIONSHIP: A vocabulary for describing relationships between people
    </dc:title>
    <dc:description>A vocabulary for describing relationships between people</dc:description>
    <dc:identifier>http://purl.org/vocab/relationship/rel-vocab-20040308</dc:identifier>
    <dcterm:isVersionOf rdf:resource="http://purl.org/vocab/relationship"/>
    <dcterm:replaces rdf:resource="http://www.perceive.net/schemas/relationship/"/>
    <vann:changes rdf:resource="http://purl.org/vocab/relationship/rel-changes-20040303.html"/>
    <vann:preferredNamespaceUri>http://purl.org/vocab/relationship</vann:preferredNamespaceUri>
    <vann:preferredNamespacePrefix>rel</vann:preferredNamespacePrefix>
    <vann:example
       rdf:resource="http://purl.org/vocab/relationship/rel-example-foaf-20040303.html"
       dc:title="Using With FOAF"/>
    <vann:example
       rdf:resource="http://purl.org/vocab/relationship/rel-example-html-20040308.html"
       dc:title="Using With HTML and XHTML"/>
    <dcterm:hasFormat>
      <rdf:Description rdf:about="http://purl.org/vocab/relationship/rel-vocab-20040308.html">
        <dc:format>
          <dcterm:IMT>
            <rdf:value>text/html</rdf:value>
            <rdfs:label xml:lang="en">HTML</rdfs:label>
          </dcterm:IMT>
        </dc:format>
      </rdf:Description>
    </dcterm:hasFormat>
    <dcterm:hasFormat>
      <rdf:Description rdf:about="http://purl.org/vocab/relationship/rel-vocab-20040308.rdf">
        <dc:format>
          <dcterm:IMT>
            <rdf:value>application/rdf+xml</rdf:value>
            <rdfs:label xml:lang="en">RDF</rdfs:label>
          </dcterm:IMT>
        </dc:format>
      </rdf:Description>
    </dcterm:hasFormat>
  </rdf:Description>
  
  <owl:SymmetricProperty rdf:about="http://purl.org/vocab/relationship/friendOf">
    <vann:term>friendOf</vann:term>
    <owl:sameAs rdf:resource="http://www.perceive.net/schemas/relationship/friendOf"/>
    <rdfs:subPropertyOf
       rdf:resource="http://xmlns.com/foaf/0.1/knows"
       rdfs:label="knows"/>
    <rdfs:label xml:lang="en">Friend Of</rdfs:label>
    <rdfs:comment xml:lang="en">A person who shares mutual friendship with this person.</rdfs:comment>
    <rdfs:domain
       rdf:resource="http://xmlns.com/foaf/0.1/Person"
       rdfs:label="Person"/>
    <rdfs:range
       rdf:resource="http://xmlns.com/foaf/0.1/Person"
       rdfs:label="Person"/>
    <rdfs:isDefinedBy rdf:resource="http://purl.org/vocab/relationship/"/>
  </owl:SymmetricProperty>
  
  <owl:SymmetricProperty rdf:about="http://purl.org/vocab/relationship/acquaintanceOf">
    <owl:sameAs rdf:resource="http://www.perceive.net/schemas/relationship/acquaintanceOf"/>
    <rdfs:subPropertyOf
       rdf:resource="http://xmlns.com/foaf/0.1/knows"
       rdfs:label="knows"/>
    <rdfs:label xml:lang="en">Acquaintance Of</rdfs:label>
    <rdfs:comment xml:lang="en">
      A person having more than slight or superficial knowledge of this person 
      but short of friendship.
    </rdfs:comment>
    <rdfs:domain
       rdf:resource="http://xmlns.com/foaf/0.1/Person"
       rdfs:label="Person"/>
    <rdfs:range
       rdf:resource="http://xmlns.com/foaf/0.1/Person"
       rdfs:label="Person"/>
    <rdfs:isDefinedBy rdf:resource="http://purl.org/vocab/relationship/"/>
  </owl:SymmetricProperty>
  
  <rdf:Property rdf:about="http://purl.org/vocab/relationship/parentOf">
    <owl:sameAs rdf:resource="http://www.perceive.net/schemas/relationship/parentOf"/>
    <owl:inverseOf
       rdf:resource="http://purl.org/vocab/relationship/childOf"
       rdfs:label="Child Of"/>
    <rdfs:subPropertyOf
       rdf:resource="http://xmlns.com/foaf/0.1/knows"
       rdfs:label="knows"/>
    <rdfs:label xml:lang="en">Parent Of</rdfs:label>
    <rdfs:comment xml:lang="en">
      A person who has given birth to or nurtured and raised this person.
    </rdfs:comment>
    <rdfs:domain
       rdf:resource="http://xmlns.com/foaf/0.1/Person"
       rdfs:label="Person"/>
    <rdfs:range
       rdf:resource="http://xmlns.com/foaf/0.1/Person"
       rdfs:label="Person"/>
    <rdfs:isDefinedBy rdf:resource="http://purl.org/vocab/relationship/"/>
  </rdf:Property>
  
  <owl:SymmetricProperty rdf:about="http://purl.org/vocab/relationship/siblingOf">
    <owl:sameAs rdf:resource="http://www.perceive.net/schemas/relationship/siblingOf"/>
    <rdfs:subPropertyOf
       rdf:resource="http://xmlns.com/foaf/0.1/knows"
       rdfs:label="knows"/>
    <rdfs:label xml:lang="en">Sibling Of</rdfs:label>
    <rdfs:comment xml:lang="en">
      A person having one or both parents in common with this person.
    </rdfs:comment>
    <rdfs:domain
       rdf:resource="http://xmlns.com/foaf/0.1/Person"
       rdfs:label="Person"/>
    <rdfs:range
       rdf:resource="http://xmlns.com/foaf/0.1/Person"
       rdfs:label="Person"/>
    <rdfs:isDefinedBy rdf:resource="http://purl.org/vocab/relationship/"/>
  </owl:SymmetricProperty>
  
  <rdf:Property rdf:about="http://purl.org/vocab/relationship/childOf">
    <owl:sameAs rdf:resource="http://www.perceive.net/schemas/relationship/childOf"/>
    <owl:inverseOf
       rdf:resource="http://purl.org/vocab/relationship/parentOf"
       rdfs:label="Parent Of"/>
    <rdfs:subPropertyOf
       rdf:resource="http://xmlns.com/foaf/0.1/knows"
       rdfs:label="knows"/>
    <rdfs:label xml:lang="en">Child Of</rdfs:label>
    <rdfs:comment xml:lang="en">
      A person who was given birth to or nurtured and raised by this person.
    </rdfs:comment>
    <rdfs:domain
       rdf:resource="http://xmlns.com/foaf/0.1/Person"
       rdfs:label="Person"/>
    <rdfs:range
       rdf:resource="http://xmlns.com/foaf/0.1/Person"
       rdfs:label="Person"/>
    <rdfs:isDefinedBy rdf:resource="http://purl.org/vocab/relationship/"/>
  </rdf:Property>
  
  <rdf:Property rdf:about="http://purl.org/vocab/relationship/grandchildOf">
    <owl:sameAs rdf:resource="http://www.perceive.net/schemas/relationship/grandchildOf"/>
    <owl:inverseOf
       rdf:resource="http://purl.org/vocab/relationship/grandparentOf"
       rdfs:label="Grandparent Of"/>
    <rdfs:subPropertyOf
       rdf:resource="http://xmlns.com/foaf/0.1/knows"
       rdfs:label="knows"/>
    <rdfs:label xml:lang="en">Grandchild Of</rdfs:label>
    <rdfs:comment xml:lang="en">A person who is a child of any of this person's children.</rdfs:comment>
    <rdfs:domain
       rdf:resource="http://xmlns.com/foaf/0.1/Person"
       rdfs:label="Person"/>
    <rdfs:range
       rdf:resource="http://xmlns.com/foaf/0.1/Person"
       rdfs:label="Person"/>
    <rdfs:isDefinedBy rdf:resource="http://purl.org/vocab/relationship/"/>
  </rdf:Property>
  
  <owl:SymmetricProperty rdf:about="http://purl.org/vocab/relationship/spouseOf">
    <owl:sameAs rdf:resource="http://www.perceive.net/schemas/relationship/spouseOf"/>
    <rdfs:subPropertyOf
       rdf:resource="http://xmlns.com/foaf/0.1/knows"
       rdfs:label="knows"/>
    <rdfs:label xml:lang="en">Spouse Of</rdfs:label>
    <rdfs:comment xml:lang="en">A person who is married to this person.</rdfs:comment>
    <rdfs:domain
       rdf:resource="http://xmlns.com/foaf/0.1/Person"
       rdfs:label="Person"/>
    <rdfs:range
       rdf:resource="http://xmlns.com/foaf/0.1/Person"
       rdfs:label="Person"/>
    <rdfs:isDefinedBy rdf:resource="http://purl.org/vocab/relationship/"/>
  </owl:SymmetricProperty>
  
  <rdf:Property rdf:about="http://purl.org/vocab/relationship/enemyOf">
    <owl:sameAs rdf:resource="http://www.perceive.net/schemas/relationship/enemyOf"/>
    <rdfs:subPropertyOf
       rdf:resource="http://xmlns.com/foaf/0.1/knows"
       rdfs:label="knows"/>
    <rdfs:label xml:lang="en">Enemy Of</rdfs:label>
    <rdfs:comment xml:lang="en">
      A person towards whom this person feels hatred, intends injury to, or 
      opposes the interests of.
    </rdfs:comment>
    <rdfs:domain
       rdf:resource="http://xmlns.com/foaf/0.1/Person"
       rdfs:label="Person"/>
    <rdfs:range
       rdf:resource="http://xmlns.com/foaf/0.1/Person"
       rdfs:label="Person"/>
    <rdfs:isDefinedBy rdf:resource="http://purl.org/vocab/relationship/"/>
  </rdf:Property>
  
  <rdf:Property rdf:about="http://purl.org/vocab/relationship/antagonistOf">
    <owl:sameAs rdf:resource="http://www.perceive.net/schemas/relationship/antagonistOf"/>
    <rdfs:subPropertyOf
       rdf:resource="http://xmlns.com/foaf/0.1/knows"
       rdfs:label="knows"/>
    <rdfs:label xml:lang="en">Antagonist Of</rdfs:label>
    <rdfs:comment xml:lang="en">A person who opposes and contends against this person.</rdfs:comment>
    <rdfs:domain
       rdf:resource="http://xmlns.com/foaf/0.1/Person"
       rdfs:label="Person"/>
    <rdfs:range
       rdf:resource="http://xmlns.com/foaf/0.1/Person"
       rdfs:label="Person"/>
    <rdfs:isDefinedBy rdf:resource="http://purl.org/vocab/relationship/"/>
  </rdf:Property>
  
  <rdf:Property rdf:about="http://purl.org/vocab/relationship/ambivalentOf">
    <owl:sameAs rdf:resource="http://www.perceive.net/schemas/relationship/ambivalentOf"/>
    <rdfs:subPropertyOf
       rdf:resource="http://xmlns.com/foaf/0.1/knows"
       rdfs:label="knows"/>
    <rdfs:label xml:lang="en">Ambivalent Of</rdfs:label>
    <rdfs:comment xml:lang="en">
      A person towards whom this person has mixed feelings or emotions.
    </rdfs:comment>
    <rdfs:domain
       rdf:resource="http://xmlns.com/foaf/0.1/Person"
       rdfs:label="Person"/>
    <rdfs:range
       rdf:resource="http://xmlns.com/foaf/0.1/Person"
       rdfs:label="Person"/>
    <rdfs:isDefinedBy rdf:resource="http://purl.org/vocab/relationship/"/>
  </rdf:Property>
  
  <owl:SymmetricProperty rdf:about="http://purl.org/vocab/relationship/lostContactWith">
    <rdfs:subPropertyOf
       rdf:resource="http://xmlns.com/foaf/0.1/knows"
       rdfs:label="knows"/>
    <rdfs:label xml:lang="en">Lost Contact With</rdfs:label>
    <rdfs:comment xml:lang="en">
      A person who was once known by this person but has subsequently become 
      uncontactable.
    </rdfs:comment>
    <rdfs:domain
       rdf:resource="http://xmlns.com/foaf/0.1/Person"
       rdfs:label="Person"/>
    <rdfs:range
       rdf:resource="http://xmlns.com/foaf/0.1/Person"
       rdfs:label="Person"/>
    <rdfs:isDefinedBy rdf:resource="http://purl.org/vocab/relationship/"/>
  </owl:SymmetricProperty>
  
  <rdf:Property rdf:about="http://purl.org/vocab/relationship/knowsOf">
    <rdfs:subPropertyOf
       rdf:resource="http://xmlns.com/foaf/0.1/knows"
       rdfs:label="knows"/>
    <rdfs:label xml:lang="en">Knows Of</rdfs:label>
    <rdfs:comment xml:lang="en">
      A person who has come to be known to this person through their actions 
      or position.
    </rdfs:comment>
    <rdfs:domain
       rdf:resource="http://xmlns.com/foaf/0.1/Person"
       rdfs:label="Person"/>
    <rdfs:range
       rdf:resource="http://xmlns.com/foaf/0.1/Person"
       rdfs:label="Person"/>
    <rdfs:isDefinedBy rdf:resource="http://purl.org/vocab/relationship/"/>
  </rdf:Property>
  
  <rdf:Property rdf:about="http://purl.org/vocab/relationship/wouldLikeToKnow">
    <rdfs:subPropertyOf
       rdf:resource="http://xmlns.com/foaf/0.1/knows"
       rdfs:label="knows"/>
    <rdfs:label xml:lang="en">Would Like to Know</rdfs:label>
    <rdfs:comment xml:lang="en">A person whom this person would desire to know more closely.</rdfs:comment>
    <rdfs:domain
       rdf:resource="http://xmlns.com/foaf/0.1/Person"
       rdfs:label="Person"/>
    <rdfs:range
       rdf:resource="http://xmlns.com/foaf/0.1/Person"
       rdfs:label="Person"/>
    <rdfs:isDefinedBy rdf:resource="http://purl.org/vocab/relationship/"/>
  </rdf:Property>
  
  <rdf:Property rdf:about="http://purl.org/vocab/relationship/knowsInPassing">
    <rdfs:subPropertyOf
       rdf:resource="http://xmlns.com/foaf/0.1/knows"
       rdfs:label="knows"/>
    <rdfs:label xml:lang="en">Knows In Passing</rdfs:label>
    <rdfs:comment xml:lang="en">
      A person whom this person has slight or superficial knowledge of.
    </rdfs:comment>
    <rdfs:domain
       rdf:resource="http://xmlns.com/foaf/0.1/Person"
       rdfs:label="Person"/>
    <rdfs:range
       rdf:resource="http://xmlns.com/foaf/0.1/Person"
       rdfs:label="Person"/>
    <rdfs:isDefinedBy rdf:resource="http://purl.org/vocab/relationship/"/>
  </rdf:Property>
  
  <rdf:Property rdf:about="http://purl.org/vocab/relationship/knowsByReputation">
    <rdfs:subPropertyOf
       rdf:resource="http://xmlns.com/foaf/0.1/knows"
       rdfs:label="knows"/>
    <rdfs:label xml:lang="en">Knows By Reputation</rdfs:label>
    <rdfs:comment xml:lang="en">
      A person known by this person primarily for a particular action, 
      position or field of endeavour.
    </rdfs:comment>
    <rdfs:domain
       rdf:resource="http://xmlns.com/foaf/0.1/Person"
       rdfs:label="Person"/>
    <rdfs:range
       rdf:resource="http://xmlns.com/foaf/0.1/Person"
       rdfs:label="Person"/>
    <rdfs:isDefinedBy rdf:resource="http://purl.org/vocab/relationship/"/>
  </rdf:Property>
  
  <owl:SymmetricProperty rdf:about="http://purl.org/vocab/relationship/closeFriendOf">
    <rdfs:subPropertyOf
       rdf:resource="http://xmlns.com/foaf/0.1/knows"
       rdfs:label="knows"/>
    <rdfs:label xml:lang="en">Close Friend Of</rdfs:label>
    <rdfs:comment xml:lang="en">
      A person who shares a close mutual friendship with this person.
    </rdfs:comment>
    <rdfs:domain
       rdf:resource="http://xmlns.com/foaf/0.1/Person"
       rdfs:label="Person"/>
    <rdfs:range
       rdf:resource="http://xmlns.com/foaf/0.1/Person"
       rdfs:label="Person"/>
    <rdfs:isDefinedBy rdf:resource="http://purl.org/vocab/relationship/"/>
  </owl:SymmetricProperty>
  
  <owl:SymmetricProperty rdf:about="http://purl.org/vocab/relationship/hasMet">
    <rdfs:subPropertyOf
       rdf:resource="http://xmlns.com/foaf/0.1/knows"
       rdfs:label="knows"/>
    <rdfs:label xml:lang="en">Has Met</rdfs:label>
    <rdfs:comment xml:lang="en">
      A person who has met this person whether in passing or longer.
    </rdfs:comment>
    <rdfs:domain
       rdf:resource="http://xmlns.com/foaf/0.1/Person"
       rdfs:label="Person"/>
    <rdfs:range
       rdf:resource="http://xmlns.com/foaf/0.1/Person"
       rdfs:label="Person"/>
    <rdfs:isDefinedBy rdf:resource="http://purl.org/vocab/relationship/"/>
  </owl:SymmetricProperty>
  
  <owl:SymmetricProperty rdf:about="http://purl.org/vocab/relationship/worksWith">
    <rdf:type rdf:resource="http://www.w3.org/2002/07/owl#TransitiveProperty"/>
    <rdfs:subPropertyOf
       rdf:resource="http://xmlns.com/foaf/0.1/knows"
       rdfs:label="knows"/>
    <rdfs:label xml:lang="en">Works With</rdfs:label>
    <rdfs:comment xml:lang="en">A person who works for the same employer as this person.</rdfs:comment>
    <rdfs:domain
       rdf:resource="http://xmlns.com/foaf/0.1/Person"
       rdfs:label="Person"/>
    <rdfs:range
       rdf:resource="http://xmlns.com/foaf/0.1/Person"
       rdfs:label="Person"/>
    <rdfs:isDefinedBy rdf:resource="http://purl.org/vocab/relationship/"/>
  </owl:SymmetricProperty>
  
  <owl:SymmetricProperty rdf:about="http://purl.org/vocab/relationship/colleagueOf">
    <rdfs:subPropertyOf
       rdf:resource="http://xmlns.com/foaf/0.1/knows"
       rdfs:label="knows"/>
    <rdfs:label xml:lang="en">Colleague Of</rdfs:label>
    <rdfs:comment xml:lang="en">
      A person who is a member of the same profession as this person.
    </rdfs:comment>
    <rdfs:domain
       rdf:resource="http://xmlns.com/foaf/0.1/Person"
       rdfs:label="Person"/>
    <rdfs:range
       rdf:resource="http://xmlns.com/foaf/0.1/Person"
       rdfs:label="Person"/>
    <rdfs:isDefinedBy rdf:resource="http://purl.org/vocab/relationship/"/>
  </owl:SymmetricProperty>
  
  <owl:SymmetricProperty rdf:about="http://purl.org/vocab/relationship/collaboratesWith">
    <rdfs:subPropertyOf
       rdf:resource="http://xmlns.com/foaf/0.1/knows"
       rdfs:label="knows"/>
    <rdfs:label xml:lang="en">Collaborates With</rdfs:label>
    <rdfs:comment xml:lang="en">A person who works towards a common goal with this person.</rdfs:comment>
    <rdfs:domain
       rdf:resource="http://xmlns.com/foaf/0.1/Person"
       rdfs:label="Person"/>
    <rdfs:range
       rdf:resource="http://xmlns.com/foaf/0.1/Person"
       rdfs:label="Person"/>
    <rdfs:isDefinedBy rdf:resource="http://purl.org/vocab/relationship/"/>
  </owl:SymmetricProperty>
  
  <rdf:Property rdf:about="http://purl.org/vocab/relationship/employerOf">
    <owl:inverseOf
       rdf:resource="http://purl.org/vocab/relationship/employedBy"
       rdfs:label="Employed By"/>
    <rdfs:subPropertyOf
       rdf:resource="http://xmlns.com/foaf/0.1/knows"
       rdfs:label="knows"/>
    <rdfs:label xml:lang="en">Employer Of</rdfs:label>
    <rdfs:comment xml:lang="en">A person who engages the services of this person.</rdfs:comment>
    <rdfs:domain
       rdf:resource="http://xmlns.com/foaf/0.1/Person"
       rdfs:label="Person"/>
    <rdfs:range
       rdf:resource="http://xmlns.com/foaf/0.1/Person"
       rdfs:label="Person"/>
    <rdfs:isDefinedBy rdf:resource="http://purl.org/vocab/relationship/"/>
  </rdf:Property>
  
  <rdf:Property rdf:about="http://purl.org/vocab/relationship/employedBy">
    <owl:inverseOf
       rdf:resource="http://purl.org/vocab/relationship/employerOf"
       rdfs:label="Employer Of"/>
    <rdfs:subPropertyOf
       rdf:resource="http://xmlns.com/foaf/0.1/knows"
       rdfs:label="knows"/>
    <rdfs:label xml:lang="en">Employed By</rdfs:label>
    <rdfs:comment xml:lang="en">A person for whom this person's services have been engaged.</rdfs:comment>
    <rdfs:domain
       rdf:resource="http://xmlns.com/foaf/0.1/Person"
       rdfs:label="Person"/>
    <rdfs:range
       rdf:resource="http://xmlns.com/foaf/0.1/Person"
       rdfs:label="Person"/>
    <rdfs:isDefinedBy rdf:resource="http://purl.org/vocab/relationship/"/>
  </rdf:Property>
  
  <rdf:Property rdf:about="http://purl.org/vocab/relationship/mentorOf">
    <owl:inverseOf
       rdf:resource="http://purl.org/vocab/relationship/apprenticeTo"
       rdfs:label="Apprentice To"/>
    <rdfs:subPropertyOf
       rdf:resource="http://xmlns.com/foaf/0.1/knows"
       rdfs:label="knows"/>
    <rdfs:label xml:lang="en">Mentor Of</rdfs:label>
    <rdfs:comment xml:lang="en">
      A person who serves as a trusted counselor or teacher to this person.
    </rdfs:comment>
    <rdfs:domain
       rdf:resource="http://xmlns.com/foaf/0.1/Person"
       rdfs:label="Person"/>
    <rdfs:range
       rdf:resource="http://xmlns.com/foaf/0.1/Person"
       rdfs:label="Person"/>
    <rdfs:isDefinedBy rdf:resource="http://purl.org/vocab/relationship/"/>
  </rdf:Property>
  
  <rdf:Property rdf:about="http://purl.org/vocab/relationship/apprenticeTo">
    <owl:inverseOf
       rdf:resource="http://purl.org/vocab/relationship/mentorOf"
       rdfs:label="Mentor Of"/>
    <rdfs:subPropertyOf
       rdf:resource="http://xmlns.com/foaf/0.1/knows"
       rdfs:label="knows"/>
    <rdfs:label xml:lang="en">Apprentice To</rdfs:label>
    <rdfs:comment xml:lang="en">
      A person to whom this person serves as a trusted counselor or teacher.
    </rdfs:comment>
    <rdfs:domain
       rdf:resource="http://xmlns.com/foaf/0.1/Person"
       rdfs:label="Person"/>
    <rdfs:range
       rdf:resource="http://xmlns.com/foaf/0.1/Person"
       rdfs:label="Person"/>
    <rdfs:isDefinedBy rdf:resource="http://purl.org/vocab/relationship/"/>
  </rdf:Property>
  
  <owl:SymmetricProperty rdf:about="http://purl.org/vocab/relationship/livesWith">
    <rdf:type rdf:resource="http://www.w3.org/2002/07/owl#TransitiveProperty"/>
    <rdfs:subPropertyOf
       rdf:resource="http://xmlns.com/foaf/0.1/knows"
       rdfs:label="knows"/>
    <rdfs:label xml:lang="en">Lives With</rdfs:label>
    <rdfs:comment xml:lang="en">A person who shares a residence with this person.</rdfs:comment>
    <rdfs:domain
       rdf:resource="http://xmlns.com/foaf/0.1/Person"
       rdfs:label="Person"/>
    <rdfs:range
       rdf:resource="http://xmlns.com/foaf/0.1/Person"
       rdfs:label="Person"/>
    <rdfs:isDefinedBy rdf:resource="http://purl.org/vocab/relationship/"/>
  </owl:SymmetricProperty>
  
  <owl:SymmetricProperty rdf:about="http://purl.org/vocab/relationship/neighborOf">
    <rdf:type rdf:resource="http://www.w3.org/2002/07/owl#TransitiveProperty"/>
    <rdfs:subPropertyOf
       rdf:resource="http://xmlns.com/foaf/0.1/knows"
       rdfs:label="knows"/>
    <rdfs:label xml:lang="en">Neighbor Of</rdfs:label>
    <rdfs:comment xml:lang="en">A person who lives in the same locality as this person.</rdfs:comment>
    <rdfs:domain
       rdf:resource="http://xmlns.com/foaf/0.1/Person"
       rdfs:label="Person"/>
    <rdfs:range
       rdf:resource="http://xmlns.com/foaf/0.1/Person"
       rdfs:label="Person"/>
    <rdfs:isDefinedBy rdf:resource="http://purl.org/vocab/relationship/"/>
  </owl:SymmetricProperty>
  
  <rdf:Property rdf:about="http://purl.org/vocab/relationship/grandparentOf">
    <owl:inverseOf
       rdf:resource="http://purl.org/vocab/relationship/grandchildOf"
       rdfs:label="Grandchild Of"/>
    <rdfs:subPropertyOf
       rdf:resource="http://xmlns.com/foaf/0.1/knows"
       rdfs:label="knows"/>
    <rdfs:label xml:lang="en">Grandparent Of</rdfs:label>
    <rdfs:comment xml:lang="en">A person who is the parent of any of this person's parents.</rdfs:comment>
    <rdfs:domain
       rdf:resource="http://xmlns.com/foaf/0.1/Person"
       rdfs:label="Person"/>
    <rdfs:range
       rdf:resource="http://xmlns.com/foaf/0.1/Person"
       rdfs:label="Person"/>
    <rdfs:isDefinedBy rdf:resource="http://purl.org/vocab/relationship/"/>
  </rdf:Property>
  
  <owl:SymmetricProperty rdf:about="http://purl.org/vocab/relationship/lifePartnerOf">
    <rdfs:subPropertyOf
       rdf:resource="http://xmlns.com/foaf/0.1/knows"
       rdfs:label="knows"/>
    <rdfs:label xml:lang="en">Life Partner Of</rdfs:label>
    <rdfs:comment xml:lang="en">
      A person who has made a long-term commitment to this person's.
    </rdfs:comment>
    <rdfs:domain
       rdf:resource="http://xmlns.com/foaf/0.1/Person"
       rdfs:label="Person"/>
    <rdfs:range
       rdf:resource="http://xmlns.com/foaf/0.1/Person"
       rdfs:label="Person"/>
    <rdfs:isDefinedBy rdf:resource="http://purl.org/vocab/relationship/"/>
  </owl:SymmetricProperty>
  
  <owl:SymmetricProperty rdf:about="http://purl.org/vocab/relationship/engagedTo">
    <rdfs:subPropertyOf
       rdf:resource="http://xmlns.com/foaf/0.1/knows"
       rdfs:label="knows"/>
    <rdfs:label xml:lang="en">Engaged To</rdfs:label>
    <rdfs:comment xml:lang="en">A person to whom this person is betrothed.</rdfs:comment>
    <rdfs:domain
       rdf:resource="http://xmlns.com/foaf/0.1/Person"
       rdfs:label="Person"/>
    <rdfs:range
       rdf:resource="http://xmlns.com/foaf/0.1/Person"
       rdfs:label="Person"/>
    <rdfs:isDefinedBy rdf:resource="http://purl.org/vocab/relationship/"/>
  </owl:SymmetricProperty>
  
  <owl:TransitiveProperty rdf:about="http://purl.org/vocab/relationship/ancestorOf">
    <owl:inverseOf
       rdf:resource="http://purl.org/vocab/relationship/descendantOf"
       rdfs:label="Descendant Of"/>
    <rdfs:subPropertyOf
       rdf:resource="http://xmlns.com/foaf/0.1/knows"
       rdfs:label="knows"/>
    <rdfs:label xml:lang="en">Ancestor Of</rdfs:label>
    <rdfs:comment xml:lang="en">A person who is a descendant of this person.</rdfs:comment>
    <rdfs:domain
       rdf:resource="http://xmlns.com/foaf/0.1/Person"
       rdfs:label="Person"/>
    <rdfs:range
       rdf:resource="http://xmlns.com/foaf/0.1/Person"
       rdfs:label="Person"/>
    <rdfs:isDefinedBy rdf:resource="http://purl.org/vocab/relationship/"/>
  </owl:TransitiveProperty>
  
  <owl:TransitiveProperty rdf:about="http://purl.org/vocab/relationship/descendantOf">
    <owl:inverseOf
       rdf:resource="http://purl.org/vocab/relationship/ancestorOf"
       rdfs:label="Ancestor Of"/>
    <rdfs:subPropertyOf
       rdf:resource="http://xmlns.com/foaf/0.1/knows"
       rdfs:label="knows"/>
    <rdfs:label xml:lang="en">Descendant Of</rdfs:label>
    <rdfs:comment xml:lang="en">A person from whom this person is descended.</rdfs:comment>
    <rdfs:domain
       rdf:resource="http://xmlns.com/foaf/0.1/Person"
       rdfs:label="Person"/>
    <rdfs:range
       rdf:resource="http://xmlns.com/foaf/0.1/Person"
       rdfs:label="Person"/>
    <rdfs:isDefinedBy rdf:resource="http://purl.org/vocab/relationship/"/>
  </owl:TransitiveProperty>
  
  <rdfs:Class rdf:about="http://purl.org/vocab/relationship/Relationship">
    <rdfs:label xml:lang="en">Relationship</rdfs:label>
    <rdfs:comment xml:lang="en">
      A particular type of connection existing between people related to or 
      having dealings with each other.
    </rdfs:comment>
    <rdfs:isDefinedBy rdf:resource="http://purl.org/vocab/relationship/"/>
  </rdfs:Class>
  
  <rdf:Property rdf:about="http://purl.org/vocab/relationship/participantIn">
    <rdfs:subPropertyOf
       rdf:resource="http://xmlns.com/foaf/0.1/knows"
       rdfs:label="knows"/>
    <rdfs:label xml:lang="en">Participant In</rdfs:label>
    <rdfs:domain
       rdf:resource="http://xmlns.com/foaf/0.1/Person"
       rdfs:label="Person"/>
    <rdfs:range rdf:resource="http://purl.org/vocab/relationship/Relationship"/>
    <rdfs:isDefinedBy rdf:resource="http://purl.org/vocab/relationship/"/>
  </rdf:Property>
  
  <rdf:Property rdf:about="http://purl.org/vocab/relationship/participant">
    <rdfs:subPropertyOf
       rdf:resource="http://xmlns.com/foaf/0.1/knows"
       rdfs:label="knows"/>
    <rdfs:label xml:lang="en">Participant</rdfs:label>
    <rdfs:domain rdf:resource="http://purl.org/vocab/relationship/Relationship"/>
    <rdfs:range
       rdf:resource="http://xmlns.com/foaf/0.1/Person"
       rdfs:label="Person"/>
    <rdfs:isDefinedBy rdf:resource="http://purl.org/vocab/relationship/"/>
  </rdf:Property>
</rdf:RDF>