link:roleType 

The roleType element definition - used to define custom
role values in XBRL extended links.

Element Information

Model

link:definition{0,1} , link:usedOn+
Children: link:definition, link:usedOn

Attributes

QName Type Fixed Default Use Inheritable Annotation
id country:ID optional
roleURI xl:nonEmptyURI required

Source 

<element name="roleType">
  <annotation>
    <documentation>The roleType element definition - used to define custom role values in XBRL extended links.</documentation>
  </annotation>
  <complexType>
    <sequence>
      <element ref="link:definition" minOccurs="0"/>
      <element ref="link:usedOn" maxOccurs="unbounded"/>
    </sequence>
    <attribute name="roleURI" type="xl:nonEmptyURI" use="required"/>
    <attribute name="id" type="ID"/>
  </complexType>
</element>

Sample