Specifies whether to generate the <b><i>Namespace Overview</i></b> pages/blocks.
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When specified, the <i>Namespace Overview</i> will be generated for each namespace being documented (i.e. targeted by at least one of the documented XML schemas).
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<b>See Also:</b>
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<i>"Details | Namespace Overview"</i> parameter group, which controls the exact content of each <i>Namespace Overview</i> page/block.
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