## ALP Programming Guide and Reference

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### Structure Field Name

An identifier becomes a Structure-FieldName when it is defined in a STRUCT directive. If the assembler is operating in M510 mode, or if the OPTION OLDSTRUCTS directive has been specified, then a Structure-FieldName is a globally-scoped identifier treated as a special variation of a Numeric- EquateName and can be used in the same contexts. Otherwise, a Structure- FieldName is private to the defining structure and is only accessible in expressions through use of the Structure/Union Field Selection (. Operator) .