要添加必须通过扩展导出的属性，要添加必须通过限制导出的构面.因此，对于元素的子内容，必须分两个步骤完成.该属性可以内联定义:

To add attributes you have to derive by extension, to add facets you have to derive by restriction. Therefore this has to be done in two steps for the element's child content. The attribute can be defined inline:

<xsd:simpleType name="timeValueType">
  <xsd:restriction base="xsd:token">
    <xsd:pattern value="\d{2}:\d{2}"/>
  </xsd:restriction>
</xsd:simpleType>

<xsd:complexType name="timeType">
  <xsd:simpleContent>
    <xsd:extension base="timeValueType">
      <xsd:attribute name="format">
        <xsd:simpleType>
          <xsd:restriction base="xsd:token">
            <xsd:enumeration value="seconds"/>
            <xsd:enumeration value="minutes"/>
            <xsd:enumeration value="hours"/>
          </xsd:restriction>
        </xsd:simpleType>
      </xsd:attribute>
    </xsd:extension>
  </xsd:simpleContent>
</xsd:complexType>