From definition is the format used to describe the gui elements in all DG3 product. It is basically a python code file in a special format, where a dict specifies the the element to load.

"""
Description of the form
"""

title = 'Title of the form'

form = {
    'type' : 'page',
    'name' : 'referencename',
    'layout' : 'grid',
    'elements' : [],
}

The basic structure.