<xsd:group name="名称型-固有要素グループ"> <xsd:sequence> <xsd:element ref="ic:カナ表記" minOccurs="0" maxOccurs="1" /> <xsd:element ref="ic:ローマ字表記" minOccurs="0" maxOccurs="1" /> </xsd:sequence> </xsd:group>