How to add another attribute to xsi:nil element?

[Studly]

I have problem generating xml(gml) by marshalling classes generated from xsd(I'm using maven2 xjc plugin).Problem occurs with elements which have gml:nilReason attribute which looks like this:\[code\] <element name="foo" nillable="true" maxOccurs="unbounded"> <complexType> <complexContent> <extension base="string"> <attribute name="nilReason" type="gml:NilReasonType"/> </extension> </complexContent> </complexType> </element>\[/code\]The generated class looks like this:\[code\]@XmlAccessorType(XmlAccessType.FIELD)@XmlType(name = "")public static class Foo extends String{ @XmlAttribute protected List<String> nilReason; /** * Gets the value of the nilReason property. * * <p> * This accessor method returns a reference to the live list, * not a snapshot. Therefore any modification you make to the * returned list will be present inside the JAXB object. * This is why there is not a <CODE>set</CODE> method for the nilReason property. * * <p> * For example, to add a new item, do as follows: * <pre> * getNilReason().add(newItem); * </pre> * * * <p> * Objects of the following type(s) are allowed in the list * {@link String } * * */ public List<String> getNilReason() { if (nilReason == null) { nilReason = new ArrayList<String>(); } return this.nilReason; } public boolean isSetNilReason() { return ((this.nilReason!= null)&&(!this.nilReason.isEmpty())); } public void unsetNilReason() { this.nilReason = null; } public boolean isNil() { return nil; } public void setNil(boolean nil) { this.nil = nil; }}\[/code\]Problem is that the attribute nilReason should be set together with xsi:nil. If I create instance of Foo and add to nilReason list value ex. "template" it wouldn't have xsi:nil attribute set to true. If I add null object to list i will get xsi:nil="true" but i can't set nilReason value.I tried to look for some binding methods but with no luck.The only solution i have found is to manually add attribute to the generated class like this:\[code\]@XmlAttribute(namespace = "http://www.w3.org/2001/XMLSchema-instance") private boolean nil;\[/code\]but i really like to avoid interfering into generated classes.Any ideas?