character set
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... 2047draft to allow the specification of the language to be used for
display as well as the character set.
...
... parameter values. This makes
it impossible to have parameter values in character sets other
than US-ASCII without specifying some sort of private per-
...
... It has recently become clear that character set information
is not sufficient to properly display some sorts of
information -- language ...
...
Some parameter values may need to be qualified with character set or
language information. It is clear that a distinguished parameter
...
... Asterisks ("*") are reused to provide the indicator that language and
character set information is present and encoding is being used. A
single quote ("'") is used to delimit the character set ...
... character set information is present and encoding is being used. A
single quote ("'") is used to delimit the character set and language
information at the beginning of the parameter value ...
...
Specifically, an asterisk at the end of a parameter name acts as an
indicator that character set and language information may appear at
the beginning of the parameter value ...
... the beginning of the parameter value. A single quote is used to
separate the character set, language, and actual value information in
...
...
Note that it is perfectly permissible to leave either the character
set or language field blank. Note also that the single quote
delimiters MUST be present even when one of the field values is
...
... language field blank. Note also that the single quote
delimiters MUST be present even when one of the field values is
omitted. This is done when either character set, language, or both
are not relevant to the parameter value ...
... are not relevant to the parameter value at hand. This MUST NOT be
done in order to indicate a default character set or language --
parameter field definitions ...
... language --
parameter field definitions MUST NOT assign a default character set
or lanugage.
...
... Combining Character Set, Language, and Parameter Continuations ...
...
Character set and language information may be combined with the
parameter continuation mechanism. For example:
...
... Language and character set information only appear at
the beginning of a given parameter value.
...
... Continuations do not provide a facility for using more
than one character set or language in the same parameter
value.
...
... segment of a continuation MUST be encoded if
language and character set information are given.
...
... parameter value is
encoded the language and character set field delimiters MUST
be present even when the fields are left blank.
...
... RFC 2047draft provides support for non-US-ASCII character sets in RFC 822std11(-> 2822prop)
message header ...
... display, it is sometimes necessary to associate language information
with encoded words as well as just the character set. This
specification extends the definition of an encoded word to allow the
inclusion of such information. This is simply done by suffixing the
...
... specification extends the definition of an encoded word to allow the
inclusion of such information. This is simply done by suffixing the
character set specification with an asterisk followed by the language
tag. For example:
...
... Character sets which allow specification of language ...
...
In the future it is likely that some character sets will provide
facilities for inline language labelling. Such facilities are
...
... Weider, C., Preston, C., Simonsen, K., Alvestrand, H., Atkinson, R., Crispin, M., Svanberg, P., "Report from the IAB Character Set Workshop", RFC 2130, April 1997. ...