--- /dev/null
+NegotiationRecordDefinition-charSetandLanguageNegotiation-3
+{Z39-50-negotiationRecordDefinition CharSetandLanguageNegotiation-3 (3)}
+DEFINITIONS ::= BEGIN
+IMPORTS LanguageCode FROM RecordSyntax-explain;
+
+CharSetandLanguageNegotiation ::= CHOICE{
+ proposal [1] IMPLICIT OriginProposal,
+ response [2] IMPLICIT TargetResponse}
+--
+-- For character sets:
+-- Origin proposes one, two, or all three of the following, in order of
+-- preference:
+-- (a) 2022 character sets.
+-- (b) 10646 character set.
+-- (c) Private character set.
+--
+-- The target responds with one of (a), (b), or (c), indicating the
+-- character set(s) to be supported for all name and message strings.
+--
+-- If the origin includes (a),
+-- the origin proposes:
+-- (1) A proposed environment: 7-bit, 8-bit, or no-preference.
+-- (2) A set of iso 2022 registration numbers.
+-- (3) One or more proposed initial sets of registration numbers,
+-- for c0, c1, g0, g1, g2 and g3. These must come from (2).
+-- (4) The proposed encoding level.
+-- And if the target selects (a), it responds with:
+-- (1) A selected environment: 7-bit or 8-bit.
+-- (2) A subset of the set of iso 2022 registration numbers proposed
+-- by the origin.
+-- (3) The initial set of registrations, which must come from (2)
+-- but need not be from the set of initial registrations proposed
+-- by the origin.
+-- (4) The encoding level; less than or equal to that proposed.
+--
+-- If the origin includes (b),
+-- The origin proposes:
+-- (1) (optionally) A list of collections (i.e. subsets of characters from the
+-- complete 10646 definition).
+-- (2) An implementation level.
+-- (3) Syntax/form: e.g. ucs-2, ucs-4, utf-8, utf-16.
+-- And if the target selects (b), it responds by choosing a subset of the
+-- collections proposed by the origin in (1) and an implementation level less
+-- than or equal to that proposed by the origin in (2).
+--
+-- If the origin includes (c), the origin proposes one of the following:
+-- (1) A list of private character sets, by one or more object
+-- identifiers.
+-- (2) A list of private character sets, by an EXTERNAL.
+-- (3) An indication to use a private, previously agreed upon
+-- character set.
+-- And if the target selects (c):
+-- - If the origin proposed (1), the target should respond with (1), and
+-- the list of object identifiers should be a subset of the list that
+-- the origin included.
+-- - If the origin proposed (2), the target should respond with (2), using
+-- the same EXTERNAL definition (but not necessarily the same content)
+-- used by the origin.
+-- - If the origin proposed (3), the target should respond with (3).
+--
+-- For Languages:
+-- The origin optionally proposes one or more language codes. The target
+-- response may include a single language code, which indicates the
+-- language to be used for all message strings. The target may include or
+-- omit this, whether or not the origin included a proposed set, and the
+-- language code indicated need not be from among those proposed.
+--
+--
+
+OriginProposal ::= SEQUENCE {
+ proposedCharSets [1] IMPLICIT SEQUENCE OF CHOICE{
+ -- Each should occur at most once, and in order of preference
+ -- (the "order of preference" is the reason why this is
+ -- "SEQUENCE OF CHOICE" rather than just "SEQUENCE")
+ iso2022 [1] Iso2022,
+ iso10646 [2] IMPLICIT Iso10646,
+ private [3] PrivateCharacterSet} OPTIONAL,
+ -- proposedCharSets must be omitted
+ -- if origin proposes version 2
+ proposedlanguages [2] IMPLICIT SEQUENCE OF LanguageCode OPTIONAL,
+ recordsInSelectedCharSets [3] IMPLICIT BOOLEAN OPTIONAL
+ -- default 'false'. See rule 6 above.
+ }
+
+TargetResponse ::= SEQUENCE{
+ selectedCharSets [1] CHOICE{
+ iso2022 [1] Iso2022,
+ iso10646 [2] IMPLICIT Iso10646,
+ private [3] PrivateCharacterSet,
+ none [4] IMPLICIT NULL
+ -- If selected, no negotiation
+ -- is assumed to be in force
+ -- for character sets.
+ } OPTIONAL,
+ -- Omitted if and only if proposedCharSets
+ -- was Omitted in the request.
+ selectedLanguage [2] IMPLICIT LanguageCode OPTIONAL,
+ recordsInSelectedCharSets [3] IMPLICIT BOOLEAN OPTIONAL
+ -- Omitted if and only if 'recordsInSelectedCharSets' was omitted
+ -- in the request. See rule 6 above.
+ }
+
+
+PrivateCharacterSet ::= CHOICE{
+ viaOid [1] IMPLICIT SEQUENCE OF OBJECT IDENTIFIER,
+ externallySpecified [2] IMPLICIT EXTERNAL,
+ previouslyAgreedUpon [3] IMPLICIT NULL}
+
+-- IMPORTED
+-- LanguageCode ::= GeneralString -- from ANSI Z39.53-1994
+
+-- Definition of ISO2022
+-- For ISO 2022, the following is negotiated:
+-- 1) The environment: 7-bit or 8-bit;
+-- 2) a set of registration numbers (from the ISO Register of coded
+-- character sets) for graphical and control character sets;
+-- 3) g0, g1, g2, g3, c0, c1, the registration numbers of the graphical and
+-- control character sets that are initially designated to g0, g1, etc.
+-- The origin submits one or more sequences of values for
+-- g0, g1, g2, g3, c0, c1 (for each sequence: at least one of
+-- g0 and g1 must be included; g2 and g3 are optional and
+-- may be included only if g1 is included;
+-- c0 should be included; and c1 is optional); the target
+-- selects one of the proposed sequences.
+-- 4) gleft: which of g0, g1, g2 or g3, initially has GL shift status in
+-- an 8-bit environment or has shift status in a 7-bit environment; and
+-- 5) gright: which of g1, g2 or g3 initially has GR shift status in an
+-- 8-bit environment.
+
+Iso2022 ::= CHOICE{
+ originProposal [1] IMPLICIT SEQUENCE{
+ proposedEnvironment [0] Environment OPTIONAL,
+ -- omitted means no preference
+ proposedSets [1] IMPLICIT SEQUENCE OF INTEGER,
+ proposedInitialSets [2] IMPLICIT SEQUENCE OF
+ InitialSet,
+ proposedLeftAndRight [3] IMPLICIT LeftAndRight},
+ targetResponse [2] IMPLICIT SEQUENCE{
+ selectedEnvironment [0] Environment,
+ selectedSets [1] IMPLICIT SEQUENCE OF INTEGER,
+ selectedinitialSet [2] IMPLICIT InitialSet,
+ selectedLeftAndRight [3] IMPLICIT LeftAndRight}}
+
+Environment ::= CHOICE{
+ sevenBit [1] IMPLICIT NULL,
+ eightBit [2] IMPLICIT NULL}
+
+InitialSet::= SEQUENCE{
+ g0 [0] IMPLICIT INTEGER OPTIONAL,
+ g1 [1] IMPLICIT INTEGER OPTIONAL,
+ -- one of g0 and g1 must be included
+ g2 [2] IMPLICIT INTEGER OPTIONAL,
+ g3 [3] IMPLICIT INTEGER OPTIONAL,
+ --g2 and/or g3 may be included
+ -- only if g1 was included
+ c0 [4] IMPLICIT INTEGER,
+ c1 [5] IMPLICIT INTEGER OPTIONAL}
+
+LeftAndRight ::= SEQUENCE{
+ gLeft [3] IMPLICIT INTEGER{
+ g0 (0),
+ g1 (1),
+ g2 (2),
+ g3 (3)},
+ gRight [4] IMPLICIT INTEGER{
+ g1 (1),
+ g2 (2),
+ g3 (3)} OPTIONAL}
+
+-- Definition of Iso10646
+--
+-- The 10646 object identifier looks like:
+-- 1.0.10646.1.implementationLevel.repertoireSubset.arc1.arc2. ....
+--
+-- (The second '1' is for "part 1" of 10646.)
+--
+-- ImplementationLevel is 1-3
+--
+-- repertoireSubset is 0 or 1, for 'all' or 'collections'.
+-- The arcs are present only if repertoireSubset is 'collections',
+-- in which case arc1, arc2, etc., are the
+-- identifiers of collections of character repertoires.
+--
+-- There is a second 10646 oid, for specifying syntax/form:
+-- 1.0.10646.1.0.form
+--
+-- (The second '0' represents "transfer syntax".)
+--
+-- where values of form include:
+-- 2: ucs-2
+-- 4: ucs-4
+-- 5: utf-16
+-- 8: utf-8
+
+Iso10646 ::= SEQUENCE{
+ collections [1] IMPLICIT OBJECT IDENTIFIER OPTIONAL,
+ --oid of form 1.0.10646.1.implementationLevel
+ -- .repertoireSubset.arc1.arc2. ....
+ -- Target to choose a subset of the collections
+ -- proposed by the origin, and an implementation level
+ -- less than or equal to that proposed.
+ --
+ -- when 'collections' is omitted,
+ -- 'implementationLevel' defaults to 3.
+ --
+ encodingLevel [2] IMPLICIT OBJECT IDENTIFIER
+ -- oid of form 1.0.10646.1.0.form
+ -- where value of 'form' is 2, 4, 5, or 8
+ -- for ucs-2, ucs-4, utf-16, utf-8
+ }
+END
+
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