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This property determines if field appearances are pre-generated
or not.
Many PDF viewing applications are unable to generate field appearances
dynamically. This means that they are unable to display fields given
the field and the value of that field. Instead they require the
appearance of the field to be pre-generated.
A new appearance will only be generated when it is required. Typically
this is when the value of a field changes.
It is unlikely you will want to change the value of this property.
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