xml验证失败“ cvc-complex-type.2.4.a：..”

Question

我有这个xml（在右下方）：标签<property>可以包含任意顺序的任意混合的<action>，<validation>，<lov>元素

<!-- ... -->
<property>
    <action>foo</action>
    <validation>bar</validation>
    <lov>baz</lov>
</property>

<property>
    <action>foo1</action>
    <validation>bar</validation>
    <action>foo2</action> 
</property>

<property>
    <action>foo1</action>
    <action>foo2</action> 
    <action>foo3</action>     
</property>

现在，我正在构建一个xsd（在Eclipse中）以验证此xml，然后我想到了这一点（使用<xsd:all>）：

<!-- ... -->
<complexType name="propertyType">
    <all minOccurs="0" maxOccurs="unbounded">
        <element name="validation" type="tns:validationType" minOccurs="0" maxOccurs="unbounded"></element>
        <element name="lov" type="tns:lovType" minOccurs="0" maxOccurs="unbounded"></element>
        <element name="action" type="tns:actionType" maxOccurs="unbounded" minOccurs="0"></element>

    </all>
</complexType>

BUT验证失败

<!-- ... -->
<property>
    <action>foo</action>
    <validation>bar</validation>
    <lov>baz</lov>
</property>

<property>
    <action>foo1</action>
    <validation>bar</validation>
    <action>foo2</action>         <!-- ERROR !? -->
</property>

<property>
    <action>foo1</action>
    <action>foo2</action>        <!-- ERROR !? -->
    <action>foo3</action>     
</property> 

出现此错误

cvc-complex-type.2.4.a：发现无效的内容（从元素“ action”开始）。之一  '{“ http://www.example.org/dm”：验证，“ http://www.example.org/dm”：lov}'。

我在这里缺少什么？