Mapping Services Facility › Type Description and Formats › BIT STRING Type › Boolean BIT STRING Access

Boolean BIT STRING Access

Boolean BIT STRING access deals with individual bit level access and operates only through named values. We recommend this access because program access to bits is only via their symbolic named values, thus removing from NCL the need to know relative bit positions.

For Boolean BIT STRING access to be invoked the named value of a bit is provided by NCL as an additional name segment after the BIT STRING component name. Since the BIT STRING type is primitive, the additional name in the name hierarchy is understood to be a named value, and is treated as a BOOLEAN type. No matter where the named value is in the BIT STRING the value of the bit is always 0 or 1, as for a BOOLEAN type.