B2BCatalogDatePeriodFixedFrom

start
type	xs:date
occurs	1
description	the catalog is valid from this date on

end
type	xs:date
occurs	0..1
description	the catalog is valid until this date

<xs:complexType name="B2BCatalogDatePeriodFixedFrom">
  <xs:sequence>
    <xs:element name="start" type="xs:date"/>
    <xs:element minOccurs="0" name="end" type="xs:date"/>
  </xs:sequence>
</xs:complexType>