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What is the meaning of the XXX indicator in Unicode charts

Consider the Unicode diagram for C1 Controls and the Latin-1 add-on in Unicode Charts . If a symbol has a glyph, it is shown that if it does not have a glyph, a special dashed line and a symbolic marker or identifier are specified. In this case, both 0080 and 0081 seem to have some “invalid token”, which, it seems to me, means “XXX”. Is that what it means?

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Secondly, what should be the behavior of a string type with Unicode support that has the value stored in a string of values ​​0x80 (hex) or 128 (decimal)? If it is converted to some other point, for example, such as:

  • The value of byte 128 in many ANSI code documents is the EURO token.
  • 128 U + 20AC?

"", API API MBCS Unicode, Java, , U + 0080? , , Java ( ANSI Unicode ), <control>, , . , PAD

- ? Unicode School? ?

0080 0098 - . . , XXX , Unicode ?

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1

. 17 ( ) Unicode Standard, . 573, " ", , , . ". , , C1 Controls.

Unicode , . 16, . 544, C0 C1 : " Unicode , . , , / 6429: 1992". , / 6429: 1992.

C1 Controls ISO/IEC 6429: 1992. , , U + 0080, " " "XXX". , , Unicode - , .

, "XXX" "", " undefined ". , - , U + 0080 .

; , , , , , , () . ; undefined. Unicode, , , .

, 0x80, 8- , Windows-1252. , , , ISO-8859-1 (, , 0x80 U + 0080), -, Windows-1252. , , U + 0080, ISO-8859-1; 0x80 , ISO-8859-1, , Windows-1252, . ISO-8859-1 windows-1252; HTML5 .

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