cvc-complex-type.2.4.a：发现以元素 'param' 开头的无效内容。应为“{param}”之一

Question

以下是我的xsd和xml

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<xs:schema version="1.0" targetNamespace="http://example.com/DashboardSchema" xmlns:tns="http://example.com/DashboardSchema" xmlns:xs="http://www.w3.org/2001/XMLSchema">

  <xs:element name="dashboard" type="tns:xmlDashboard"/>

  <xs:complexType name="xmlDashboard">
    <xs:sequence>
      <xs:element name="param" type="tns:xmlDashboardParameter" minOccurs="0" maxOccurs="unbounded"/>
    </xs:sequence>
  </xs:complexType>

  <xs:complexType name="xmlDashboardParameter">
    <xs:sequence/>
    <xs:attribute name="module" type="xs:int" use="required"/>
    <xs:attribute name="node" type="xs:int" use="required"/>
    <xs:attribute name="parameter" type="xs:int" use="required"/>
  </xs:complexType>
</xs:schema>


<dashboard xmlns="http://example.com/DashboardSchema"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://example.com/DashboardSchema ./schema3.xsd">
    <param module="1" node="1" parameter="4" />
    <param module="1" node="2" parameter="6" />
    <param module="2" node="0" parameter="4" />
    <param module="2" node="0" parameter="5" />
</dashboard>

当我尝试在 Eclipse 中验证 xml 时，出现上述错误。我做错了什么？

Answer 1

您可能希望参数位于架构的目标命名空间中，在这种情况下，您应该将 elementFormDefault="qualified" 添加到 xs:schema 元素。

这几乎总是可以使用的正确设置。不幸的是，XSD 设计师将默认值弄错了。

这也是一条糟糕的错误消息：如果您使用的是撒克逊语，它会说

Validation error on line 4 of test.xml:
  XSD: In content of element <dashboard>: The content model does not allow element
  <Q{.../DashboardSchema}param> to appear as the first child. The element is in namespace
  http://example.com/DashboardSchema but it should be in no namespace. 
  Validating /dashboard[1]/param[1]
  See http://www.w3.org/TR/xmlschema11-1/#cvc-complex-type clause 2.4

cvc-complex-type.2.4.a：发现以元素 'param' 开头的无效内容。应为“{param}”之一

cvc-complex-type.2.4.a: Invalid content was found starting with element 'param'. One of '{param}' is expected

xml

eclipse

xsd