tei:att.declarable.attribute.default

<xs:attributeGroup name="att.declarable.attribute.default">
  <xs:attribute name="default" default="false">
    <xs:annotation>
      <xs:documentation>indicates whether or not this element is selected by default when its parent is selected.</xs:documentation>
    </xs:annotation>
    <xs:simpleType>
      <xs:restriction base="xs:token">
        <xs:enumeration value="true">
          <xs:annotation>
            <xs:documentation>This element is selected if its parent is selected</xs:documentation>
          </xs:annotation>
        </xs:enumeration>
        <xs:enumeration value="false">
          <xs:annotation>
            <xs:documentation>This element can only be selected explicitly, unless it is the only one of its kind, in which case it is selected if its parent is selected.</xs:documentation>
          </xs:annotation>
        </xs:enumeration>
      </xs:restriction>
    </xs:simpleType>
  </xs:attribute>
</xs:attributeGroup>