Accessing the variables of a nested comp

Hi,
I have a main comp and a shapes comp. The shapes comp is nested in the main comp. The shapes comp contains an inner rectangle and an outer rectangle and the outer rectangle is on layer 1.  In the main comp I need to change the opacity of the outer rectangle without effecting its inner rectangle. 
I've tried: comp("shapes comp").layer(1).transform.opacity=50; in the opacity of the main comp but this changes the opacity of the entire shapes comp.
Any help would be greatly appreciated.
Thanks.

The answer is no.  A comp has no way of knowing what comp it is nested in.
Also, in your original post it looks like you were trying to set the value of the opacity property of the layer from an expression on another property (on another layer in another comp).  In expressions, only user-defined variables can be written to.  Everything else, including the values of layer properties, is read-only.  The only way you can modify the value of a property is by applying an expression to that property, and you don't modify the value through an assignment statement (e.g. "opacity = 50"), but rather by writing the last statement of the expression such that it evaluates to the desired value (e.g. "50").  That's the "expression" part of expressions.

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