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                                        690
CHAPTER 8                                                          Interactive Features



   12 0 obj                                     % Second radio button
      << /Parent 10 0 R
         /AS /Off
         /AP << /N << /Visa 8 0 R
                        /Off 9 0 R
                     >>
              >>
      >>
   endobj

   8 0 obj                                      % Appearance stream for "on" state
       << /Resources 20 0 R
          /Length 104
       >>
   stream
       q
          0 0 1 rg
          BT
             /ZaDb 12 Tf
             0 0 Td
             ( 8 ) Tj
          ET
       Q
   endstream
   endobj

   9 0 obj                                      % Appearance stream for "off" state
       << /Resources 20 0 R
          /Length 104
       >>
   stream
       q
          0 0 1 rg
          BT
             /ZaDb 12 Tf
             0 0 Td
             ( 4 ) Tj
          ET
       Q
   endstream
   endobj

Like a check box field, a radio button field can use the optional Opt entry in the
field dictionary (PDF 1.4) to define export values for its constituent radio buttons,

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