throw tooManyAttributes();
        }
        super.setRefid( ref );
    }

    public String getId()
    {
        if ( isReference() )
        {
            return getRef().getId();
        }
        return id;
    }

    public void setId( String id )
    {
        this.id = id;
    }

    public String getUrl()
    {
        if ( isReference() )
        {
            return getRef().getUrl();
        }
        return url;
    }

    public void setUrl( String url )
    {
        checkAttributesAllowed();
        this.url = url;
    }

    public String getType()
    {
        if ( isReference() )
        {
            return getRef().getType();
        }
        return ( type != null ) ? type : "default";
    }

    public void setType( String type )
    {
        checkAttributesAllowed();
        this.type = type;
    }

    public String getMirrorOf()