question: gets the value of the track property . 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 set method for the track property . for example , to add a new item , do as follows : gettrack . add newitem ; objects of the following type s are allowed in the list tracks.disc.track concode_field_sep BigInteger number concode_elem_sep List<Tracks.Disc> disc concode_elem_sep List<Tracks.Disc.Track> track concode_elem_sep String value concode_field_sep BigInteger getNumber concode_elem_sep BigInteger getNumber concode_elem_sep String getValue concode_elem_sep List<Tracks.Disc> getDisc concode_elem_sep void setValue concode_elem_sep void setNumber concode_elem_sep void setNumber
target: List < Tracks . Disc . Track > function ( ) { if ( track == null ) { track = new ArrayList < Tracks . Disc . Track > ( ) ; } return this . track ; }