shadow tree vs. shadow DOM

Why does the SVG spec. and the mapping guide refer to a shadow tree?. I believe it should be a shadow DOM. This is important as the DOM defines a tree and it also defines how events bubble. We have no definition for  your shadow “tree” does this. 

Please consider the use of the term “tree”.

Note: web components also uses the term shadow DOM and similar functionality is going on for web components in that id references are scoped within the context of the web component or <use> href document instance.

Rich
Rich Schwerdtfeger