Revised the text in the 'Using a form in a view' section.

       })

There are three code paths here:

1. If the form has not been submitted, an unbound instance of ContactForm is

   created and passed to the template.

2. If the form has been submitted, a bound instance of the form is created

   using ``request.POST``. If the submitted data is valid, it is processed

   and the user is re-directed to a "thanks" page.

3. If the form has been submitted but is invalid, the bound form instance is

   passed on to the template.

The distinction between **bound** and **unbound** forms is important. An unbound

form does not have any data associated with it; when rendered to the user, it

will be empty or will contain default values. A bound form does have submitted

data, and hence can be used to tell if that data is valid. If an invalid bound

form is rendered it can include inline error messages telling the user where

they went wrong.

See :ref:`ref-forms-api-bound-unbound` for further information on the

differences between bound and unbound forms.

There are three possible code paths here:

+------------------+---------------+-----------------------------------------+

| Form submitted?  | Data?         | What occurs                             |

+==================+===============+=========================================+

| Unsubmitted      | None yet      | Template gets passed unbound instance   |

|                  |               | of ContactForm.                         |

+------------------+---------------+-----------------------------------------+

| Submitted        | Invalid data  | Template gets passed bound instance     |

|                  |               | of ContactForm.                         |

+------------------+---------------+-----------------------------------------+

| Submitted        | Valid data    | Valid data is processed. Redirect to a  |

|                  |               | "thanks" page.                          |

+------------------+---------------+-----------------------------------------+

The distinction between :ref:`ref-forms-api-bound-unbound` is important:

* An unbound form has no data associated with it. When rendered to the user,

  it will be empty or will contain default values.

* A bound form has submitted data, and hence can be used to tell if that data

  is valid. If an invalid bound form is rendered, it can include inline error

  messages telling the user what data to correct.

Handling file uploads with a form

---------------------------------