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[ddlm-group] Vote on BOM

For clarity, by 'UTF8 BOM' I mean the byte sequence 0xEF,0xBB,0xBF,
which corresponds to Unicode code point 0xFEFF.  A UCS2 BOM is the
byte sequence 0xFE, 0xFF or the reverse.

Please indicate your preferred behaviour below.  I have inserted mine already:

1. Treatment of UTF8 BOM as first three bytes of a CIF2 file
    (a) Syntax error/Non CIF2 file
    (b) UTF8-BOM followed by #\#CIF2.0 is a valid CIF2 magic number
2. Treatment of UTF8 BOM in a CIF file, other than as the first three bytes:
    (a) Always a syntax error
    (b) Syntactic whitespace
    (c) An ordinary character:
          (i) May appear only in delimited data values and comments
          (ii) May appear anywhere other ordinary characters can
appear (i.e. including datanames, datablock names etc.)
    (d) Silently ignored

3. Treatment of UCS BOM in a CIF file
   (a) Syntax error                                    James
   (b) Encoding switch
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