By default, the main logo is shown, but if I decide not to show it,
the special logo is shown in its place. Optional regions are extremely powerful.
Optional regions work somewhat like a cross between repeating region and editable attributes. Like repeating
regions, optional regions can surround any portion of a page; also, they are not editable by default,
although it??™s possible to create an editable optional region. After an optional region has been placed on the
template page??”as with editable attributes??”the Template Properties dialog box is used to set the condition
that displays or hides the content on a template-derived page.
The conditions that control an optional region range from a basic true-false or Boolean statement to more
complex, evaluated expressions. Reflecting this, the New Optional Region dialog box contains two tabs,
Basic and Advanced. Under the Basic tab, you simply enter the name for the optional region and indicate
whether to display the region by default. The Advanced tab, shown in Figure 28-12, gives you the opportunity
to set the condition dependent on another existing template parameter or enter a template expression.
FIGURE 28-12
Optional regions can be controlled by the state of another parameter directly or by the evaluation of a template
expression.
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