<xsd:attributeGroup name="period">
  <xsd:annotation>
    <xsd:documentation>
      <type>Attlist</type>
      <name>period</name>
      <comment>The period attribute is used in versioned content and metadata elements to indicate a time interval in which they were in force, in efficacy, or in any other type of interval as specified in the corresponding temporalGroup.</comment>
    </xsd:documentation>
  </xsd:annotation>
  <xsd:attribute name="period" type="temporalGroupRef"/>
</xsd:attributeGroup> |