找到以元素开头的无效内容 . 'catalog_item'

我收到错误说错误 - 第16,38行：org.xml.sax.SAXParseException; lineNumber：16; columnNumber：38; cvc-complex-type.2.4.d：从元素'catalog_item'开始发现无效内容 . 此时不会有子元素 . 第16行 . 我应该编写一个xsd来验证给定的xml文件 .

这是给我的xml文件 .

<?xml version="1.0" encoding="UTF-8"?>
<catalog>
   <product description="Cardigan Sweater" product_image="cardigan.jpg">
      <catalog_item gender="Men's">
         <item_number>QWZ5671</item_number>
         <price>39.95</price>
         <size description="Medium">
            <color_swatch image="red_cardigan.jpg">Red</color_swatch>
            <color_swatch image="burgundy_cardigan.jpg">Burgundy</color_swatch>
         </size>
         <size description="Large">
            <color_swatch image="red_cardigan.jpg">Red</color_swatch>
            <color_swatch image="burgundy_cardigan.jpg">Burgundy</color_swatch>
         </size>
      </catalog_item>
      <catalog_item gender="Women's">
         <item_number>RRX9856</item_number>
         <price>42.50</price>
         <size description="Small">
            <color_swatch image="red_cardigan.jpg">Red</color_swatch>
            <color_swatch image="navy_cardigan.jpg">Navy</color_swatch>
            <color_swatch image="burgundy_cardigan.jpg">Burgundy</color_swatch>
         </size>
         <size description="Medium">
            <color_swatch image="red_cardigan.jpg">Red</color_swatch>
            <color_swatch image="navy_cardigan.jpg">Navy</color_swatch>
            <color_swatch image="burgundy_cardigan.jpg">Burgundy</color_swatch>
            <color_swatch image="black_cardigan.jpg">Black</color_swatch>
         </size>
         <size description="Large">
            <color_swatch image="navy_cardigan.jpg">Navy</color_swatch>
            <color_swatch image="black_cardigan.jpg">Black</color_swatch>
         </size>
         <size description="Extra Large">
            <color_swatch image="burgundy_cardigan.jpg">Burgundy</color_swatch>
            <color_swatch image="black_cardigan.jpg">Black</color_swatch>
         </size>
      </catalog_item>
   </product>
</catalog>

这是我上面的xml文件的xsd文件 .

<?xml version="1.0"?>
 <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
  <xs:element name="catalog">
   <xs:complexType>
    <xs:sequence>
     <xs:element name="product">
      <xs:complexType>
       <xs:sequence>
        <xs:element name="catalog_item">
         <xs:complexType>
          <xs:sequence>
           <xs:element name="item_number">
            <xs:simpleType>
             <xs:restriction base="xs:string">
              <xs:pattern value="[A-Z][A-Z][A-Z][0-9][0-9][0-9][0-9]"/>
             </xs:restriction>
            </xs:simpleType>
           </xs:element>
           <xs:element name="price" type="xs:decimal"/>
            <xs:element name="size" maxOccurs="unbounded">
        <xs:complexType>
            <xs:sequence>
              <xs:element name="color_swatch" maxOccurs="unbounded">
                <xs:complexType mixed="true">
                  <xs:attribute name="image" type="xs:string"/>
                </xs:complexType>
              </xs:element>
            </xs:sequence>
            <xs:attribute name="description" type="xs:string"/>
        </xs:complexType>
    </xs:element>
		 </xs:sequence>
		 <xs:attribute name="gender" type="xs:string"/>
		</xs:complexType>
       </xs:element>
	</xs:sequence>
	<xs:attribute name="description" type="xs:string"/>
     <xs:attribute name="product_image" type="xs:string"/>
   </xs:complexType>
  </xs:element>
  </xs:sequence>
  </xs:complexType>
 </xs:element>
 </xs:schema>