文字コード総合スレ Part12

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115: デフォルトの名無しさん [sage] 2019/01/15(火) 16:00:55.99 ID:exaSay/9

Replacement Characters: U+FFFC–U+FFFD

U+FFFC.  The U+FFFC  object replacement  character  is used as an insertion  point  for objects located within a  stream  of  text.
All other information  about the object  is kept outside the character data  stream.
Internally it is  a  dummy character that  acts as an anchor point for the object’s  formatting information.
In  addition to  assuring correct placement  of an  object in a  data  stream, the object  replacement  character allows the use of  general stream-based algorithms for any textual  aspects  of  embedded objects.

U+FFFD.  The U+FFFD  replacement  character  is the general substitute  character in the Unicode Standard.
It can be substituted for any “unknown” character in another encoding  that  cannot  be  mapped  in  terms  of  known  Unicode  characters.
It  can  also  be  used as  one  means  of  indicating  a conversion  error,  when  encountering  an  ill-formed  sequence in a conversion between Unicode encoding  forms.
See  Section 3.9, Unicode  Encoding  Forms for  detailed  recommendations on  the use of U+FFFD as replacement for ill-formed sequences. See  also  Section 5.3, Unknown and Missing  Characters  for  related  topics.

http://mevius.5ch.net/test/read.cgi/tech/1544931495/115

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