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OK, I think I've got an idea of your of your idea. Here are some comments describing my implementation: ;;; In RScheme, there are two ways for a feature to be recognized ;;; as implemented. First, the feature may be globally implemented. ;;; RScheme provides feature ids for its version tree, for example, ;;; release 0.7.3.1 implements `RScheme-0.7*', `RScheme-0.7.3*' and ;;; `RScheme-0.7.3.1'. Another example is SRFI-0 itself. If there ;;; were a SRFI for case sensitive identifiers, that would also be ;;; globally implemented. ;;; ;;; The other way in which a feature might be recognized as ;;; implemented is to have imported a module which implements the ;;; feature. This supports locally selectable features as may be ;;; represented by variable libraries such as SRFI-1. To load ;;; a portable program that prefers to have such a SRFI available, ;;; simply specify the RScheme module which implements the SRFI ;;; on the command line, like so: ;;; ;;; rs +srfi.1 portable-listy-program.scm ;;; ;;; the portable-listy-program will find (if-implements SRFI-1 t) ;;; expands to t. Does that match fairly well a superset of your idea as to what a SRFI-0 compliant implementation should do? -- Donovan Kolbly ( RScheme Development Group ( d.kolbly@xxxxxxxxxxx ( http://www.rscheme.org/~donovan/