[TxMt] refining scopes

[Oliver Taylor]

In the bundle I've created I'm attempting to refine my scopes. Take  
the following example:

INT. SHIPYARD DOCKS - DAY

The above line falls under the scopes "text.splay.screenplay" (the  
document) and "splay.slugline" (the element). What I want is to be  
able to define the three separate elements: "INT", "SHIPYARD DOCKS",  
"DAY" as independent scopes, while retaining their status as  
"splay.slugline" So "INT" would fall under the jurisdiction of  
"text.splay.screenplay splay.slugline splay.slugline.setting".

I guess the simple question is: how do you stack more than two (the  
document and the element) scopes?

In Markdown a link gets text.html.markdown,  
markup.paragraph.markdown, markup.underline.link.markdown... how do I  
do that?