<relation>

<relation> (relationship) describes any kind of relationship or linkage amongst a specified group of places, events, persons, objects or other items. [14.3.2.3 Personal Relationships]
Module namesdates — Names, Dates, People, and Places
Attributes
calendar⚓︎ indicates one or more systems or calendars to which the date represented by the content of this element belongs.
Deprecated This feature will be withdrawn after 2024-11-11
Status Optional
Datatype 1–∞ occurrences of teidata.pointer separated by whitespace
Schematron

<sch:rule context="tei:*[@calendar]">
<sch:assert test="string-length( normalize-space(.) ) gt 0"> @calendar indicates one or more
systems or calendars to which the date represented by the content of this element belongs,
but this <sch:name/> element has no textual content.</sch:assert>
</sch:rule>
name⚓︎ supplies a name for the kind of relationship of which this is an instance.
Status Optional
Datatype teidata.enumerated
active⚓︎ identifies the ‘active’ participants in a non-mutual relationship, or all the participants in a mutual one.
Status Optional
Datatype 1–∞ occurrences of teidata.pointer separated by whitespace
mutual⚓︎ supplies a list of participants amongst all of whom the relationship holds equally.
Status Optional
Datatype 1–∞ occurrences of teidata.pointer separated by whitespace
passive⚓︎ identifies the ‘passive’ participants in a non-mutual relationship.
Status Optional
Datatype 1–∞ occurrences of teidata.pointer separated by whitespace
Contained by
core: listBibl
namesdates: event listEvent listNym listObject listOrg listPerson listPlace listRelation
May contain
core: desc
Note

Only one of the attributes active and mutual may be supplied; the attribute passive may be supplied only if the attribute active is supplied. Not all of these constraints can be enforced in all schema languages.
Example
<relation type="social" name="supervisor"
 active="#p1" passive="#p2 #p3 #p4"/>

This indicates that the person with identifier p1 is supervisor of persons p2, p3, and p4.
Example
<relation type="personal" name="friends"
 mutual="#p2 #p3 #p4"/>

This indicates that p2, p3, and p4 are all friends.
Example
<relation type="CRM"
 name="P89_falls_within"
 active="http://id.clarosnet.org/places/metamorphoses/place/italy-orvieto"
 passive="http://id.clarosnet.org/places/metamorphoses/country/IT"/>

This indicates that there is a relation, defined by CIDOC CRM, between two resources identified by URLs.
Example
<relation resp="http://viaf.org/viaf/44335536/"
 ref="http://purl.org/saws/ontology#isVariantOf"
 active="http://www.ancientwisdoms.ac.uk/cts/urn:cts:greekLit:tlg3017.Syno298.sawsGrc01:divedition.divsection1.o14.a107"
 passive="http://data.perseus.org/citations/urn:cts:greekLit:tlg0031.tlg002.perseus-grc1:9.35"/>

This example records a relationship, defined by the SAWS ontology, between a passage of text identified by a CTS URN, and a variant passage of text in the Perseus Digital Library, and assigns the identification of the relationship to a particular editor (all using resolvable URIs).
Schematron

<sch:rule context="tei:relation">
<sch:assert test="@ref or @key or @name">One of the attributes @name, @ref or @key must be supplied</sch:assert>
</sch:rule>
Schematron

<sch:rule context="tei:relation">
<sch:report test="@active and @mutual">Only one of the attributes @active and @mutual may be supplied</sch:report>
</sch:rule>
Schematron

<sch:rule context="tei:relation">
<sch:report test="@passive and not(@active)">the attribute @passive may be supplied only if the attribute @active is supplied</sch:report>
</sch:rule>
Content model 
<content>
 <elementRef key="desc" minOccurs="0"/>
</content>
Schema Declaration 
<rng:element name="relation">
 <rng:ref name="att.global.attributes"/>
 <rng:ref name="att.global.rendition.attributes"/>
 <rng:ref name="att.global.linking.attributes"/>
 <rng:ref name="att.global.analytic.attributes"/>
 <rng:ref name="att.global.facs.attributes"/>
 <rng:ref name="att.global.change.attributes"/>
 <rng:ref name="att.global.responsibility.attributes"/>
 <rng:ref name="att.global.source.attributes"/>
 <rng:ref name="att.datable.attributes"/>
 <rng:ref name="att.datable.w3c.attributes"/>
 <rng:ref name="att.datable.iso.attributes"/>
 <rng:ref name="att.datable.custom.attributes"/>
 <rng:ref name="att.editLike.attributes"/>
 <rng:ref name="att.canonical.attributes"/>
 <rng:ref name="att.sortable.attributes"/>
 <rng:ref name="att.typed.attributes"/>
 <rng:optional>
  <rng:attribute name="calendar">
   <rng:list>
    <rng:oneOrMore>
     <rng:ref name="teidata.pointer"/>
    </rng:oneOrMore>
   </rng:list>
  </rng:attribute>
 </rng:optional>
 <rng:optional>
  <rng:attribute name="name">
   <rng:ref name="teidata.enumerated"/>
  </rng:attribute>
 </rng:optional>
 <rng:choice>
  <rng:optional>
   <rng:attribute name="active">
    <rng:list>
     <rng:oneOrMore>
      <rng:ref name="teidata.pointer"/>
     </rng:oneOrMore>
    </rng:list>
   </rng:attribute>
  </rng:optional>
  <rng:optional>
   <rng:attribute name="mutual">
    <rng:list>
     <rng:oneOrMore>
      <rng:ref name="teidata.pointer"/>
     </rng:oneOrMore>
    </rng:list>
   </rng:attribute>
  </rng:optional>
 </rng:choice>
 <rng:optional>
  <rng:attribute name="passive">
   <rng:list>
    <rng:oneOrMore>
     <rng:ref name="teidata.pointer"/>
    </rng:oneOrMore>
   </rng:list>
  </rng:attribute>
 </rng:optional>
 <rng:optional>
  <rng:ref name="desc"/>
 </rng:optional>
</rng:element>
element relation
{
   att.global.attributes,
   att.global.rendition.attributes,
   att.global.linking.attributes,
   att.global.analytic.attributes,
   att.global.facs.attributes,
   att.global.change.attributes,
   att.global.responsibility.attributes,
   att.global.source.attributes,
   att.datable.attributes,
   att.datable.w3c.attributes,
   att.datable.iso.attributes,
   att.datable.custom.attributes,
   att.editLike.attributes,
   att.canonical.attributes,
   att.sortable.attributes,
   att.typed.attributes,
   attribute calendar { list { teidata.pointer+ } }?,
   attribute name { teidata.enumerated }?,
   (
      attribute active { list { teidata.pointer+ } }?
    | attribute mutual { list { teidata.pointer+ } }?
   ),
   attribute passive { list { teidata.pointer+ } }?,
   desc?
}