Form specification files Form specification files are the source files defining the layout and content of application forms. Understanding form files A form specification file is a source file that defines an application form providing for end user interaction with a program. Form file concepts To write a form specification file, you need to understand the concepts described in this section. Form item types The form item types defines the purpose of form elements. Form file structure A form specification file is defined by a set of sections. Form item attributes The form item attributes reference. Examples Form definition (.per) examples.