C<to_field> method on each column of an object to return a C<HTML::Element>
object representing a form element to edit that property. These elements
are then rendered to HTML with C<as_HTML> or to XHTML with C<as_XML>.
C<to_field> method on each column of an object to return a C<HTML::Element>
object representing a form element to edit that property. These elements
are then rendered to HTML with C<as_HTML> or to XHTML with C<as_XML>.