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The ASN.1 NumericString type is recommended when you need to use digits and spaces.
NumbersOnly ::= NumericString
Number ::= NumericString targetSales Number ::= "1000000"
In BER, the NumericString type value defined in the example above is encoded as follows:
12 07 31303030303030
The NumericString type can be constrained by a single value, by size constraints, and by permitted alphabet constraints.