JAXB：限定属性禁用默认命名空间xmlns =""？ [英] JAXB: Qualified attributes disables default namespace xmlns=""?

问题描述

当我使用 @XmlSchema（attributeFormDefault = XmlNsForm.QUALIFIED，...）

或 @XmlAttribute（namespace =sample.com/y，...）

JAXB忽略 @XmlSchema（namespace =sample.com/x，...）

而不是：

<a xmlns="sample.com/y" xmlns:ns0="sample.com/y">
  <b ns0:att=""/>
</a>

生成如下内容：

<ns1:a xmlns:ns1="sample.com/x" xmlns:ns0="sample.com/y">
  <ns1:b ns0:att=""/>
</ns1:a>

这是预期的行为吗？有没有办法纠正这个问题？

Is this an expected behavior? Is there any way to correct this?

推荐答案

EclipseLink JAXB（MOXy） 根据属性表单限定条件处理元素的前缀限定（如下所示）。

EclipseLink JAXB (MOXy) is handling the prefix qualification for elements differently depending upon the attribute form qualification (as demonstrated below).

命名空间限定没有错，但我同意在可能的情况下使用默认命名空间更好。您可以使用以下错误跟踪此问题的进展：

The namespace qualification is not wrong, but I agree that the use of default namespace is better when possible. You can track the progress on this issue using the following bug:

• https://bugs.eclipse.org/353042

• https://bugs.eclipse.org/353042

A

package forum6808921;

import javax.xml.bind.annotation.XmlRootElement;

@XmlRootElement
public class A {

    private String b;

    public String getB() {
        return b;
    }

    public void setB(String b) {
        this.b = b;
    }

}

演示

package forum6808921;

import javax.xml.bind.JAXBContext;
import javax.xml.bind.Marshaller;

public class Demo {

    public static void main(String[] args) throws Exception {
        JAXBContext jc = JAXBContext.newInstance(A.class);

        A a = new A();
        a.setB("Hello World");

        Marshaller marshaller = jc.createMarshaller();
        marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
        marshaller.marshal(a, System.out);
    }

}

package-info without attributeFormDefault set

@XmlSchema(
        namespace = "sample.com/x"
        , elementFormDefault = javax.xml.bind.annotation.XmlNsForm.QUALIFIED
        )
package forum6808921;

import javax.xml.bind.annotation.*;

输出：

Output:

<?xml version="1.0" encoding="UTF-8"?>
<a xmlns="sample.com/x">
   <b>Hello World</b>
</a>

package-info with attributeFormDefault set

@XmlSchema(
        namespace = "sample.com/x"
        , elementFormDefault = javax.xml.bind.annotation.XmlNsForm.QUALIFIED
        , attributeFormDefault = javax.xml.bind.annotation.XmlNsForm.QUALIFIED
        )
package forum6808921;

import javax.xml.bind.annotation.*;

输出：

Output:

<?xml version="1.0" encoding="UTF-8"?>
<ns0:a xmlns:ns0="sample.com/x">
   <ns0:b>Hello World</ns0:b>
</ns0:a>

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