JAXB：如何解组直接父标记可能不同的特定XML标记？

Question

我正在尝试使用JAXB解组已存在（且不可更改）的xml格式。问题归结为需要<DATA>标记的内容，但是我需要的数据可以直接位于<DATA>下，也可以位于<DATA><OPTIONAL1>或<DATA><OPTIONAL1><OPTIONAL2>下。 xml具有may属性和标签，但是我将问题简化如下：

<SEC>
    <RECORD id="1">
        <SOMEOTHERTAG>Other data</SOMEOTHERTAG>
        <DATA>Data I want</DATA>
        <SOMEOTHERTAG2>Other data</SOMEOTHERTAG2>
    </RECORD>
    <RECORD id="2">
        <SOMEOTHERTAG>Other data</SOMEOTHERTAG>
        <SOMEOTHERTAG2>Other data</SOMEOTHERTAG2>
        <SOMEOTHERTAG3>Other data</SOMEOTHERTAG3>
        <DATA>
            <OPTIONAL1>Data I want</OPTIONAL1>
        </DATA>
    </RECORD>
    <RECORD id="3">
        <SOMEOTHERTAG>Other data</SOMEOTHERTAG>
        <DATA>
            <OPTIONAL1>
                <OPTIONAL2>Data I want</OPTIONAL2>
            </OPTIONAL1>
        </DATA>
    </RECORD>
    <RECORD id="4">
        <DATA>
            <OPTIONAL1>Data I want</OPTIONAL1>
        </DATA>
    </RECORD>
    <RECORD id="5">
        <SOMEOTHERTAG3>Other data</SOMEOTHERTAG3>
        <DATA>Data I want</DATA>
    </RECORD>
    <RECORD id="6">
        <DATA>Data I want</DATA>
    </RECORD>
</SEC>

这是我当前的代码（此场景再次简化）：

@XmlRootElement(name="SEC")
public class SECModel {
    @XmlElement(name="RECORD")
    List<RecordModel> recordList;

    @Override
    public String toString() {
        return "SECModel [recordList=" + recordList + "]";
    }
    @XmlTransient
    public List<RecordModel> getRecordList() {
        return recordList;
    }

    public void setRecordList(List<RecordModel> recordList) {
        this.recordList = recordList;
    }
}

public class RecordModel {
    @XmlAttribute(name="id")
    private String id;
    @XmlElement(name="SOMEOTHERTAG")
    private String someOtherTag;
    @XmlElement(name="SOMEOTHERTAG2")
    private String someOtherTag2;
    @XmlElement(name="SOMEOTHERTAG3")
    private String someOtherTag3;
    // What to put here?
    private String data;
    @Override
    public String toString() {
        return "RecordModel [id=" + id + ", data=" + data + "]";
    }
    @XmlTransient
    public String getId() {
        return id;
    }
    public void setId(String id) {
        this.id = id;
    }
    @XmlTransient
    public String getSomeOtherTag() {
        return someOtherTag;
    }
    public void setSomeOtherTag(String someOtherTag) {
        this.someOtherTag = someOtherTag;
    }
    @XmlTransient
    public String getSomeOtherTag2() {
        return someOtherTag2;
    }
    public void setSomeOtherTag2(String someOtherTag2) {
        this.someOtherTag2 = someOtherTag2;
    }
    @XmlTransient
    public String getSomeOtherTag3() {
        return someOtherTag3;
    }
    public void setSomeOtherTag3(String someOtherTag3) {
        this.someOtherTag3 = someOtherTag3;
    }
    @XmlTransient
    public String getData() {
        return data;
    }
    public void setData(String data) {
        this.data = data;
    }
}

我试图使泛型类具有3个子类来处理专门针对数据元素的每种情况，并使用@XmlElements（）将XML解组，如下所示：

 @XmlElements({ @XmlElement(name = "DATA", type = DataModelOpt1.class, required = false),
        @XmlElement(name = "DATA", type = DataModelOpt2.class, required = false)})
    private DataModelGeneric data;

但是，Jaxb似乎想将每个标签解组到DataModelOpt2.class中-也许是因为它显示在该列表的最后？正确的方法是什么？