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What are the rules for Xcode variable expansion?

I note that a path name like "$(SDKROOT_($arch))/System/Library/Frameworks" works as expected. However, one variable, "arch" has the prefix "$" inside the parentheses, while the other "SDKROOT" has the prefix "$" outside the parentheses. Using "($SDKROOT)" or "$(arch)" doesn't seem to work. (At least it doesn't seem to work for me.) I also see references in the Xcode User's Guide to "${variableName}" (using curly braces instead of parens), and sometimes just plain "$varName" with no parens or braces. What's the difference? What are the rules for referencing variables? I suspect it has to do with which tool or shell will be interpreting the string, but it's not clear.

Thanks.

Scott
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