CSN1String : SendExpression | Alternation | Intersection | Exclusion | Concatenation | BASIC_NAME ExponentExpr* | BasicString ExponentExpr*
A CSN.1 string defines a set of acceptable bit strings. Strings are combined using various operations. These operations are given in order of precedence, highest to lowest:
Table 16.1. CSN.1 Operations from highest to lowest precedence.
exponentiation (an exponent is applied to indicate repetition) |
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concatenation |
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exclusion (disallowing certain strings that would otherwise be accepted) |
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send (specifying a particular string the encoder should send, allowing decoders to accept other strings too) |
The BASIC_NAME
in the sixth alternative shall not be a multi-word name.