Classes of Data
The five categories of data items are grouped into three classes:
For alphabetic and numeric, the classes and categories are synonymous.
The alphanumeric class includes the categories of alphanumeric edited, numeric edited and alphanumeric (without editing).
Every elementary item except for an index data item belongs both to one of the classes and to one of the categories.The class of a group item is treated at object time as alphanumeric regardless of the class of elementary items subordinate to that group item.
Table depicts the relationship of the class and categories of data items.
Data Item Relationships
Standard Alignment Rules
The standard rules of positioning data within an elementary item depend on the category of the receiving item.
If the receiving data item is described as numeric:
If the receiving data item is a numeric edited data item, the data moved to the edited data item is aligned by decimal point with zero-fill or truncation at either end as required within the receiving character positions of the data item, except where editing requirements cause replacement of the leading zeroes.
If the receiving data item is alphanumeric (other than a numeric edited data item), alphanumeric edited or alphabetic, the sending data is moved to the receiving character positions and aligned at the leftmost character position in the data item with space-fill or truncation to the right, as required.
If the JUSTIFIED clause is specified for the receiving item, these standard rules are modified as described in the JUSTIFIED clause.
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