Card overview

Each map can contain none or more input cards and none or more output cards.

The maximum number of input cards in a map is 100. The maximum number of output cards in a map is 100.

Each card represents one data object, which is identified by selecting a type from a schema. A card can represent an object in a row, a row in a record, the entire record, or the entire file.

Each card specifies a schema and a type as part of the card definition. This type, and the schema that contains it, is the link between the Type Designer and the Map Designer that defines the structure and properties of the data in the card.

• The input card represents input data. Input data validation occurs in the Type Designer.
• The output card represents output data and contains the map rules that transform that data. Therefore, only the output card has a rule column.