FEATURE EXISTS()

General Form:

Where:

The FEATURE EXISTS test is used to test whether a particular KCML feature exists in this version of KCML. It can be used by application code that needs to run on several versions of KCML to determine what features are available. The feature tested for can either be a part of the KCML syntax or a built in constant (normally a record). This provides a better check for functionality than a simple version check and allows for features in later KCML to be copied back to earlier versions.

The FEATURE EXIST syntax is intended to be used at resolve time, either as part of the constant expression in DIMming a constant or within the IF CONDITION statement. In the case of syntactic features, the #if variant can be used to enclose code that is only valid syntax if that feature is supported by KCML.

Special cases

Compatibility

Introduced in KCML 7.00.

Syntax Examples

    : IF CONDITION (FEATURE EXISTS(_KCML_DEFRECORD_Entry))
    : IF CONDITION (FEATURE EXISTS(.DEFRECORD_Start))
    : IF CONDITION (FEATURE EXISTS(.DEFRECORD_Name$))
    : IF CONDITION (FEATURE EXISTS('KCML_Map_File))
    : IF CONDITION (FEATURE EXISTS(.numeric_fld))
    : IF CONDITION (FEATURE EXISTS(.string_fld$))
    :
    : DIM _UseMappedFiles = FEATURE EXISTS('KCML_Map_File)

See also:

IF CONDITION, #if