$start  = $scene                                            &join_copy  ;
$scene  = $st_scene $litem $en_scene                        &join_copy1 ;        
$litem  = $litem   $item                                    &join_litem ;
$litem  =                                              &join_empty_litem;
$item   = $shader                                           &join_copy  ;
$item   = $tex                                              &join_copy  ;
$item   = $object                                           &join_copy  ;
$item   = $camera                                           &join_copy  ;
$item   = $render                                           &join_copy  ;
$item   = $light                                            &join_copy  ;
$item   = $filter                                           &join_copy  ;
$item   = $backg                                            &join_copy  ;
$item   = $trans                                            &join_copy  ;


$shader	= $st_shader $lattr '>' $cllabel $lmod $en_shader   &join_shader;

$cllabel=  $st_attr $llabel $en_attr                        &join_copy1 ;

$trans  = '<' T_TRANS $lattr '>' $litem $en_trans        &join_transform;

$lmod   = $lmod      $mod                                     &join_lmod;
$lmod   =                                               &join_empty_lmod;

$mod    = '<' T_MODULATOR $lattr '>' $llabel  $en_modulator &join_generic;


$lattr  = $lattr     $attr                                  &join_lattr ;
$lattr  =                                              &join_empty_lattr;
$col    = $attrf     $attrf     $attrf                      &join_color ;
$col    = $attrf     $attrf     $attrf  $attrf              &join_colorA;
$attr   = T_IDE      '='        T_LITE                      &join_attr  ;
$attr   = T_IDE      '='        T_FLOAT                     &join_attrf ;
$attrf  = T_IDE      '='        T_FLOAT                     &join_attrf ;
$label  = '<'        T_IDE      $lattr   '/' '>'            &join_label ;
$llabel = $llabel    $label                                 &join_llabel;
$llabel =                                             &join_empty_llabel;

#textures

$tex    = '<' T_TEXTURE $lattr '>' $llabel  $en_tex        &join_generic;

#points

$point  = '<' T_IDE  $attrf     $attrf   $attrf  '/'  '>'   &join_point ;
$lpoint = $lpoint    $point                                 &join_lpoint;
$lpoint =                                             &join_empty_lpoint;
$points = $st_points $lpoint $en_points                     &join_points;

#faces

$face   = '<' T_IDE $lattr   '/'         '>'                &join_face  ;
$lface  = $lface    $face                                   &join_lface ;
$lface  =                                              &join_empty_lface;
$faces  = $st_faces $lface   $en_faces                      &join_faces ;

#mesh

$mesh   = $st_mesh  $lattr   '>' $points  $faces  $en_mesh  &join_mesh  ;

$sphere = $st_sphere $lattr  '>' $point   $en_sphere        &join_sphere;

#object
$geome  = $redefine                                    			&join_null  ;
$geome  = $mesh                                             &join_copy  ;
$geome  = $sphere                                           &join_copy  ;
$oattr  = '<' T_IDE $col     '/' '>'                        &join_oattr ;
$loattr = $loattr    $oattr                                 &join_loattr;
$loattr =                                             &join_empty_loattr;
$oattrs = $st_attr   $loattr $en_attr                       &join_copy1 ;
$object = $st_object $lattr  '>' $oattrs $geome $en_object  &join_object;

#camera
$camera = $st_camera $lattr  '>' $point $point $point $en_camera   &join_camera;

#render

$render = '<' T_RENDER $lattr '>' $llabel  $en_render      &join_generic;
$filter = '<' T_FILTER $lattr '>' $llabel  $en_filter      &join_generic;

#lights
$light  = '<' T_LIGHT $lattr '>' $llabel  $en_light        &join_generic;

#background
$backg  = '<' T_BACKG $lattr '>' $llabel  $en_backg        &join_generic;

$st_scene    =  '<'  T_SCENE     '>'                        &join_null  ;
$en_scene    =  '<'  '/' T_SCENE '>'                        &join_null  ;
$st_attr     =  '<'  T_ATTR     '>'                         &join_null  ;
$en_attr     =  '<'  '/' T_ATTR '>'                         &join_null  ;

$en_modulator=  '<'  '/'  T_MODULATOR  '>'                  &join_null  ;
$st_shader   =  '<'  T_SHADER                               &join_null  ;
$en_shader   =  '<'  '/'  T_SHADER     '>'                  &join_null  ;
$en_tex      =  '<'  '/' T_TEXTURE     '>'                  &join_null  ;
$st_points   =  '<'  T_POINTS          '>'                  &join_null  ;
$en_points   =  '<'  '/' T_POINTS      '>'                  &join_null  ;
$st_faces    =  '<'  T_FACES           '>'                  &join_null  ;
$en_faces    =  '<'  '/' T_FACES       '>'                  &join_null  ;
$st_mesh     =  '<'  T_MESH                                 &join_null  ;
$en_mesh     =  '<'  '/' T_MESH        '>'                  &join_null  ;
$st_object   =  '<'  T_OBJECT                               &join_null  ;
$en_object   =  '<'  '/' T_OBJECT      '>'                  &join_null  ;
$st_camera   =  '<'  T_CAMERA                               &join_null  ;
$en_camera   =  '<'  '/' T_CAMERA      '>'                  &join_null  ;
$en_render   =  '<'  '/' T_RENDER      '>'                  &join_null  ;
$st_sphere   =  '<'  T_SPHERE                               &join_null  ;
$en_sphere   =  '<'  '/' T_SPHERE      '>'                  &join_null  ;
$en_filter   =  '<'  '/' T_FILTER      '>'                  &join_null  ;
$en_light   =  '<'  '/' T_LIGHT      '>'                    &join_null  ;
$en_trans   =  '<'  '/' T_TRANS      '>'                    &join_null  ;
$en_backg   =  '<'  '/' T_BACKG      '>'                    &join_null  ;
$redefine   =  '<'  T_REDEFINE   '/' '>'                    &join_null  ;