OK, so you meant that "all the character sets used on the Internet
*may* be used with ISO 2022 escape sequences for invocation and/or
designation", not that this is common usage.
Not. ISO-8859-1 encoding of ISO 8859/1 does use GR/GL invocation
mechanism of ISO 2022, while ISO 8859/1 is also used with SS2
invocation mechanism of ISO 2022 in ISO-2022-JP-2.
Thanks for the clarification.
Read ISO 2022, before requesting clarification.
Masataka Ohta