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Defines possible border styles for fields.
Beveled: 3;
Beveled, a simulated embossed rectangle that appears to be raised above the surface of the page.
Dashed: 2;
Dashed border.
Inset: 4;
Inset, a simulated engraved rectangle that appears to be recessed below the surface of the page.
None: 0;
No border.
Solid: 1;
Solid border.
Underline: 5;
Underline, a single line along the bottom of the annotation rectangle.
Unknown: 6;
Value is unknown.