<xs:element name="limits"><xs:complexType><!-- At least one among (lowerBound, upperBound), or both --><xs:choice><xs:sequence><xs:element name="lowerCategory" type="xmcda:categoryProfileBound"/><xs:element name="upperCategory" type="xmcda:categoryProfileBound" minOccurs="0"/></xs:sequence><xs:element name="upperCategory" type="xmcda:categoryProfileBound"/></xs:choice></xs:complexType></xs:element>