Input editing is the process of interpreting presentation data based on the edit pattern picture and converting it into the appropriate internal representation. The internal representation is then stored in the associated attribute within the view.
Input editing must support all of the same specifiers as output editing. The field may be formatted based on these specifiers, then displayed, modified (or maybe not, if the Modified Data Tag is set on), read back in, and processed. Therefore, input and output editing must be synchronized such that both support the same edit specifiers and behaviors. The difference is that in output editing, an internal value is formatted for presentation. In input editing, a presentation is being interpreted to derive an internal representation.
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