/Docs/G/ProseObject-Stack/Cmacc_1.md
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The only other feature is "prefixing." When referencing another File, the Key for the reference can be empty (see below in the source view of this File) or it can be a string (see 2.= in this File). If the Key has a string, then the string is added to the front of each Key and to the front of each Variable in the referenced File. This is chained, so that if a File3 uses a prefix "Buyer." when referencing File2, and File2 uses a prefix "CEO." when referencing File1, then each of the Keys in File1 is treated as being prefixed by "Buyer.CEO." This chaining can be as long as you want. When expanding a prefixed Variable, if no match is found, then the right-most prefixing link is removed and it is tried again. ("Buyer.") (This sounds complicated, but is extremely convenient and comports with our instincts the great majority of the time.)