ield_decimals</a>,
  <a href="#label-17">shapefile.field_name</a>,
  <a href="#label-18">shapefile.field_type</a>, and
  <a href="#label-19">shapefile.field_width</a></li>
<li>DBFAddField():
  <a href="#label-12">shapefile.add_field</a></li>
<li>DBFReadIntegerAttribute(), DBFReadDoubleAttribute(), and
  DBFReadStringAttribute():
  <a href="#label-34">shape [field]</a></li>
<li>DBFIsAttributeNULL():
  called in <a href="#label-34">shape [field]</a>.
  Nil is returned if the attribute is null.</li>
<li>DBFWri