<xs:element name="attribute" substitutionGroup="xsl:instruction"> <xs:complexType> <xs:complexContent mixed="true"> <xs:extension base="xsl:sequence-constructor"> <xs:attribute name="name" type="xsl:avt" use="required"/> <xs:attribute name="namespace" type="xsl:avt"/> <xs:attribute name="select" type="xsl:expression"/> <xs:attribute name="separator" type="xsl:avt"/> <xs:attribute name="type" type="xsl:QName"/> <xs:attribute name="validation" type="xsl:validation-type"/> </xs:extension> </xs:complexContent> </xs:complexType> </xs:element>