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我正在更新一个使用 JAXB 1.0 和内部编写的 MusicXML 1.0 模式的 Java 应用程序，以使用 JAXB 2.2 和供应商提供的 MusicXML 3.0 模式。当我使用 JAXB 2.2 为 <part-list> 解组具有多个 <score-part> 子元素的文件时，仅返回 1 个 <score-part> 元素。我目前正在使用 DOM 的解决方法来获取附加的 <score-parts> 但这并不是很理想，因为我要解析文件两次以获取数据。如何让 JAXB 返回 <part-list> 中的所有 <score-parts>？

<part-list> 的 MusicXML 1.0 架构片段

<xs:element name="part-list">
<xs:complexType>
  <xs:sequence>
    <xs:element minOccurs="0" maxOccurs="unbounded" ref="part-group"/>
    <xs:element ref="score-part"/>
    <xs:choice minOccurs="0" maxOccurs="unbounded">
      <xs:element ref="part-group"/>
      <xs:element ref="score-part"/>
    </xs:choice>
  </xs:sequence>
</xs:complexType>
</xs:element>

<part-list> 的 MusicXML 3.0 架构片段

<xs:complexType name="part-list">       
<xs:sequence>
    <xs:group ref="part-group" minOccurs="0" maxOccurs="unbounded"/>
    <xs:group ref="score-part"/>
    <xs:choice minOccurs="0" maxOccurs="unbounded">
        <xs:group ref="part-group"/>
        <xs:group ref="score-part"/>
    </xs:choice>
</xs:sequence>
</xs:complexType>

用于解组的 Java 片段

package test;
import java.io.FileInputStream;
import java.util.*;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.Unmarshaller;
import recodare.MusicXML.*;
import javax.xml.bind.JAXBElement;


public class MusicXMLReader{

    private java.lang.String m_sXMLFielPath = "";
    private ScorePartwise m_spScorePartwise = null;
    public MusicXMLReader(java.lang.String filePath){
        m_sXMLFilePath = filePath;
    }
    public void processXML() throws Exception{

        JAXBContext jc = JAXBContext.newInstance("recodare.MusicXML");
        Unmarshaller u = jc.createUnmarshaller();
        m_spScorePartwise = (ScorePartwise)u.unmarshal(new FileInputStream(m_sXMLFilePath));

        PartList pl = m_spScorePartwise.getPartList();
        ScorePart scorePart = pl.getScorePart(); // 1st score-part
        // for remaining score-part or part-group this list is null even when part-list  
        // has multiple score-part elements
        List<Object> listPartGroupOrScorePart = pl.getPartGroupOrScorePart(); 
        //continue processing file

    }
}

对于测试数据，我使用来自The Unofficial MusicXML Test Suite 的文件 41a-MultiParts-Partorder.xml 和 41b-MultiParts-MoreThan10.xml

如果您希望为 MusicXML 3.0 构建 JAXB 绑定，您可能会从 JAXB 收到以下（或类似）错误

[ERROR] Property "Segno" is already defined. Use &lt;jaxb:property> to resolve this conflict.
line 2793 of file: musicxml.xsd

[ERROR] The following location is relevant to the above error
line 2800 file: musicXML.xsd
[ERROR] Property "Coda" is already defined. Use &lt;jaxb:property> to resolve this conflict.
line 2794 of musicXML.xsd

[ERROR] The following location is relevant to the above error
line 2801 of file: musicXML.xsd
[ERROR] Element "link" shows up in more than one properties.
line 4765 of file: musicXML.xsd
[ERROR] Element "bookmark" shows up in more than one properties.
line 4766 of file: musicXML.xsd

在这种情况下，请按照此处概述的步骤进行操作

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