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Discussed these concepts at 2007-08-23 telecon and t 2007-08-29 F2F. The WG decided 1. The concept "empty reference" does not carry any significant meaning, and is no different from any other non-null references. So we should remove the definition of "empty reference" (if any) and any references to it. 2. SML and SML-IF specs mentions "dangling references" and "unresolved references". They seem to be for the same concept. Some WG members feel that "dangling" implies a meaning that's not always true. WG decided to remove and replace "dangling" references with "unresolved" references.
I have removed 'Empty Reference' concept and replaced 'Dangling' with 'Unresolved' The changes have been applied to the sml-source.xml ( no occurrences of empty or dangling references outside of the SML spec )