Data Transformation Engine Integration Flow Designer Reference Guide

Chapter 9 - Links External Links
Integration Flow Designer Reference Guide
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An external link conveys more information when the map components that it
connects are expanded. In this example, you can explicitly view which targets of
one component feed which sources of the other component. When a link appears
between contracted map components, the link implicitly displays the data flow
relationship between these two components.
The IFD automatically derives and displays an external link between two
components that share common resources as sources and targets. As with internal
links, the IFD uses information in the referenced source map or compiled map files
together with any source and target overrides that you may have specified to
determine if any two components in a system definition file have a data flow
relationship.
The IFD automatically derives and displays database links, messaging links, and
file links.