JAXB, use xml attribute as a key in hashmap

i have a very simple xml

<List>
   <Item name="somename">
        .....
   </Item>
   <Item name="somename2">
   ....

in my java object i want to use name attribute as a key in a hashmap. Is it possible with jaxb? Something like

@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "List")
public class MyList {
    private HashMap<String,Item> map;
}