(ddd.info)Dependent Values

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7.3.4.1 Displaying Dependent Values
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Dependent displays are created from an existing display.  The dependency
is indicated by an "edge" leading from the originating display to the
dependent display.

   To create a dependent display, select the originating display or
display part and enter the dependent expression in the `():' argument
field.  Then click on the `Display' button.

   Using dependent displays, you can investigate the data structure of a
tree for example and lay it out according to your intuitive image of the
tree data structure.

   By default, DDD does not recognize shared data structures (i.e. a
data object referenced by multiple other data objects).  Note: Shared
Structures, for details on how to examine such structures.