<xs:element name="output-character"> <xs:complexType> <xs:complexContent> <xs:extension base="xsl:element-only-versioned-element-type"> <xs:attribute name="character" type="xsl:char" use="required" /> <xs:attribute name="string" type="xs:string" use="required" /> </xs:extension> </xs:complexContent> </xs:complexType> </xs:element>