Datatyper_19103CSLv4.0

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Real datatype

signed real (floating point) number consisting of a mantissa and an exponent, which represents a value to a precision given by the number of digits shown, but is not necessarily the exact value. The length of a real is encapsulation and usage dependent. The common binary real implementation uses base 2. Since such reals can approximate any measure where absolute accuracy is not possible, this form of numeric is most often used for measures. EXAMPLE 23.501, -1234E-4, -23.0.


CharacterString datatype

arbitrary-length sequence of characters, including accents and special characters from the repertoire of one of the adopted character sets: . ISO/IEC 10646: Universal Multi-Octet Coded Character Set (UCS), and . ISO 8859. Merknad: The maximum length of a CharacterString is dependent on encapsulation and usage. A language tag may be provided for identification of the language of string values. For an implementation mapping of a CharacterString, the handling of the following four aspects needs to be decided: 1) Representation of value, 2) Representation of character set, 3) Representation of encoding, and 4) Representation of language. This can be handled for instance by choosing ISO/IEC 10646.



Integer datatype

signed integer number; the length of an integer is encapsulation and usage dependent. It consists of an exact integer value, with no fractional part. Eksempel: 29, -65547.



Boolean enumeration

Most valuable in the predicate calculus, where items are either True or False, unless they are ill formed. (Kopiert fra ISO19103 2012-05-24, etter samtale med Morten M)