Error: The prefix "xsd" for element "xsd:schema" is not bound

Question

我对 XML 非常陌生，目前已经准备好使用 Ineasysteps。我一直从解析器那里得到同样的问题

5:The prefix "xsd" for element "xsd:schema" is not bound.

这是hello.xml:

<?xml version = "1.0" encoding = "UTF-8" ?>

<!-- XML in easy steps - Page 82. -->

<doc xmlns:xsi=
"http://www.w3.org/2001/XMLSchema-instance" 
xsi:noNamespaceSchemaLocation = "hello.xsd" >

<msg>Hello World</msg>

</doc>

这是 hello.xsd 文档

<?xml version="1.0" encoding = "UTF-8" ?>

<!-- XML in easy steps - Page 84. -->

<xsd:schema>

<!-- DECLARE ELEMENTS. -->  

<!-- Simple types. -->
<xsd:element name="msg" type="xsd:string"/>

 <!-- Complex types. -->
 <xsd:element name="doc" type="docType"/>

<!-- DEFINE STRUCTURE. -->

<xsd:complexType name="docType">
<xsd:sequence>
    <xsd:element ref="msg"/>
</xsd:sequence>
</xsd:complexType

Answer 1

必须在使用前定义名称空间前缀，例如 xsd。这甚至适用于众所周知的 xsd（或 xs）前缀，通常用于 XML 模式（XSD）的组件。

要消除错误，请通过添加

来定义 xsd 命名空间前缀

xmlns:xsd="http://www.w3.org/2001/XMLSchema"

像这样添加到 xsd:schema 根元素：

<?xml version="1.0" encoding = "UTF-8" ?>
<!-- XML in easy steps - Page 84. -->
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">

  <!-- DECLARE ELEMENTS. -->  

  <!-- Simple types. -->
  <xsd:element name="msg" type="xsd:string"/>

  <!-- Complex types. -->
  <xsd:element name="doc" type="docType"/>

  <!-- DEFINE STRUCTURE. -->

  <xsd:complexType name="docType">
    <xsd:sequence>
      <xsd:element ref="msg"/>
    </xsd:sequence>
  </xsd:complexType>
</xsd:schema>

Error: The prefix "xsd" for element "xsd:schema" is not bound

Error: The prefix "xsd" for element "xsd:schema" is not bound

xml

xsd

xsd-validation

xml-validation