language
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... to specify the language to be used should the value be
displayed, and
...
... This memo also defines an extension to the encoded words defined in
RFC 2047draft to allow the specification of the language to be used for
display as well as the character set.
...
... character set information
is not sufficient to properly display some sorts of
information -- language information is also needed [RFC-2130].
For example, support for handicapped users may require reading
...
... RFC-2130].
For example, support for handicapped users may require reading
text string aloud. The language the text is written in is
needed for this to be done correctly. Some parameter values
...
... parameter values
may need to be displayed, hence there is a need to allow for
the inclusion of language information.
...
... parameter values may need to be qualified with character set or
language information. It is clear that a distinguished parameter
name is needed to identify when this information is present along
with a specific syntax for the information in the value itself. In
...
...
Asterisks ("*") are reused to provide the indicator that language and
character set information is present and encoding ...
... encoding is being used. A
single quote ("'") is used to delimit the character set and language
information at the beginning of the parameter value. Percent signs
...
... 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. A single quote is used to
...
... parameter value. A single quote is used to
separate the character set, language, and actual value information in
the parameter value ...
...
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
omitted. This is done when either character set ...
... 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 at hand. This MUST NOT be
...
... parameter value at hand. This MUST NOT be
done in order to indicate a default character set or language --
parameter field definitions MUST NOT assign a default character set ...
... 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.
...
... The first segment of a continuation MUST be encoded if
language and character set information are given.
...
... segment of a continued parameter value is
encoded the language and character set field delimiters MUST
be present even when the fields are left blank.
...
... Language specification in Encoded Words ...
... This is done by defining an encoded word construct which can appear
in any of these places. Given that these are fields intended for
display, it is sometimes necessary to associate language information
with encoded words as well as just the character set. This
...
... 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
inherently more flexible than those defined here as they allow for
language ...
... language labelling. Such facilities are
inherently more flexible than those defined here as they allow for
language switching in the middle of a string.
...
...
If and when such facilities are developed they SHOULD be used in
preference to the language labelling facilities specified here. Note
that all the mechanisms defined here allow for the omission of
language ...
... language labelling facilities specified here. Note
that all the mechanisms defined here allow for the omission of
language labels so as to be able to accomodate this possible future
usage.
...
... Alvestrand, H., "Tags for the Identification of Languages", RFC 1766(-> 3282draft | 3066(-> 4647 | 4646)), March 1995. ...