id.append( ( getGroupId() == null ) ? "[inherited]" : getGroupId() );
        id.append( ":" );
        id.append( getArtifactId() );
        id.append( ":" );
        id.append( getPackaging() );
        id.append( ":" );
        id.append( ( getVersion() == null ) ? "[inherited]" : getVersion() );

        return id.toString();
    }

    @Override
    public String toString() {

            Model target, Model source, boolean sourceDominant, Map<Object, Object> context) {
        String src = source.getPackaging();
        if (src != null) {
            if (sourceDominant || target.getPackaging() == null) {
                target.setPackaging(src);
                target.setLocation("packaging", source.getLocation("packaging"));
            }
        }
    }