<request>
    <model> text </model>
    <file name = aFileName> file contents</file>
</request>

import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.XmlType;
import org.eclipse.persistence.oxm.annotations.XmlPath;

@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(propOrder = { "model", "file",})
@XmlRootElement(name = "request")

public class RequestMsg implements Serializable {
    private static final long serialVersionUID = -5003915336631618163L;

    @XmlElement()
    private String model;

    private ElemWithAttr file;

    @XmlPath("file/@myAttr")
    private String myAttr;

// CLASS GETTERS & SETTERS
    public ElemWithAttr getFile(){
        return file;
    }

    public String getModel() {
        return model;
    }

    public void setFile(ElemWithAttr file) {
        this.file = file;
    }

    public void setModel(String model) {
        this.model = model;
    }
}

import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.XmlValue;


public class ElemWithAttr {

    @XmlValue
    public String content;

    @XmlAttribute
    public String myAttr;


// CLASS GETTERS & SETTERS
    public String getContent() {
        return content;
    }

    public String getMyAttr() {
        return myAttr;
    }

    public void setContent(String audioString) {
        this.content = audioString;
    }

    public void setMyAttr(String myAttr) {
        this.myAttr = myAttr;
    }
}