95
Building Streams
ToSet Essential Fields
ERight-click the source node of the template stream that will be replaced.
EOn the menu, click:
Data Mapping > Specify Essential Fields
Figure 5-48
Specifying essential fields
EUsing the Field Chooser, you can add or remove fields from the list. To open the Field Chooser,
click the icon to the right of the fields list.
Examining Mapped Fields
Once you have selected the point at which one data stream or data source will be mapped to
another,a dialo g box opens for you to select fields for mapping or to ensure that the system default
mapping is correct. If essential fields have been set for the stream or data so urce and they are
unmatched, these fields are displayed in red. Any unmapped field sfr om the data source will pass
through the Filter node unaltered, but note that you can map non-essential fields as well.
Figure 5-49
Selecting fields for mapping
Original. Lists all fields in the template or existing stream—all of the fields that are present further
downstream. Fields from the new data source will be mapped to these fields.