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.
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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.