<xs:complexType name="TimePeriodType"><xs:annotation><xs:appinfo><mdr:definition>Type used to model the TimePeriod sub-element of the ddms:temporalCoverage element.</mdr:definition></xs:appinfo></xs:annotation><xs:sequence><xs:element name="name" type="xs:string" default="Unknown" minOccurs="0"/><xs:element name="start" type="ExtendedCombinedDateType" default="Unknown"/><xs:element name="end" type="ExtendedCombinedDateType" default="Unknown"/></xs:sequence></xs:complexType>