diff --git a/gdtf-spec.md b/gdtf-spec.md
index 4bf1710..a540ffd 100644
--- a/gdtf-spec.md
+++ b/gdtf-spec.md
@@ -512,11 +512,12 @@ currently defined XML attributes of the wheel slot are specified in
 | Color              | [ColorCIE](#user-content-attrtype-colorcie )   | Color of the wheel slot, Default value: {0.3127, 0.3290, 100.0 } (white) For Y give relative value compared to overall output defined in property Luminous Flux of related Beam Geometry (transmissive case).                                                                                                                     |
 | Filter             | [Node](#user-content-attrtype-node )       | Optional. Link to filter in the physical description; Do not define color if filter is used; Starting point: Filter Collect                                                                                                                                                                                                       |
 | MediaFileName | [Resource](#user-content-attrtype-resource ) | Optional. PNG file name without extension containing image for specific gobos etc. <br />- Maximum resolution of picture: 1024x1024<br />- Recommended resolution of gobo: 256x256<br />- Recommended resolution of animation wheel: 256x256<br />These resource files are located in a folder called `./wheels` in the zip archive. Default value: empty. |
-
-
-
 </div>
 
+As children the attribute node can have a list of [Prism
+Facet](#user-content-prism-facet) or [Animation
+System](#user-content-animation-system).
+
 Note 1: More information on the definitions of images used in wheel slots to
 visualize gobos, animation wheels or color wheels can be found in Annex E
 "Wheel Slot Image Definition".
@@ -526,11 +527,25 @@ done via the wheel slot index. The wheel slot index of a slot is derived
 from the order of a wheel's slots. The wheel slot index is normalized to
 1.
 
-If the wheel slot has a prism, it has to have one or several children
-called [prism facet](#user-content-prism-facet ). If the wheel slot has an
+If the wheel slot describes a prism, it has to have one or several children
+called [Prism Facet](#user-content-prism-facet ). If the wheel slot describes an
 AnimationWheel, it has to have one child called [Animation
 Wheel](#user-content-animation-wheel ).
 
+The [attribute](#annex-a-normative-attribute-definitions) of a parent channel
+function of the linked channel set defines which XML attributes of a wheel slot
+should be utilized and in what order of importance:
+
+| GDTF Attribute Name | Utilized XML attribute                                      |
+|----|----|----|
+| Color(n)              | MediaFileName, Filter, Color                              |
+| Gobo(n)               | MediaFileName                                             |
+| Prism(n)              | Facet                                                     |
+| AnimationWheel(n)     | MediaFileName                                             |
+| AnimationSystem(n)    | AnimationSystem                                           |
+| MediaContent(n)       | MediaFileName                                             |
+
+
 ##### Prism Facet
 
 This section can only be defined for the prism wheel slot and has a