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layer_name
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Name of the layer
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switch
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force
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show
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The processing instruction can take a fourth parameter: a showstring. The showstring specified in this parameter will be displayed if the layer cannot be applied to the current page. It will be ignored if the layer is applied as requested.
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When using <?layer> to control under/overlay modes it is important to note that:
• The layer must already exist.
• The layers only apply to the page for which they are specified.
• The layers will not be applied to any following pages during an autocopy operation.
• Ordinary layers cannot be controlled via this PI.
• When creating a layer, a parameter value of ? is required by the mode parameter of tplay. In other words, the Mode entry field in the Add/Remove Over/Underlay dialog box must be set to Controlled by <?layer>. For more information see tplay.
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