MIMETools provides the <--#mime--> tag for DocumentTemplate.
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Currently, the MIMETools product's only function is to provide the
``<!--#mime-->`` DTML tag for the DocumentTemplate distribution.

The ``<!--#mime-->`` tag is used to construct MIME containers. The syntax of the
``<!--#mime-->`` tag is::

  <!--#mime [type=x, disposition=y, encode=z]-->
  Contents of first part
  <!--#boundary [type=x, disposition=y, encode=z]-->
  Contents of second part
  <!--#boundary [type=x, disposition=y, encode=z]-->
  Contents of nth part

The area of data between tags, called a block, is encoded into whatever is
specified with the 'encode' tag attribute for that block. If no encoding is
specified, 'base64' is defaulted. Valid encoding options include 'base64',
'quoted-printable', 'uuencode', 'x-uuencode', 'uue' and 'x-uue'. If the 'encode'
attribute is set to '7bit' no encoding is done on the block and the data is
assumed to be in a valid MIME format.

If the 'disposition' attribute is not specified for a certain block, then the
'Content-Disposition:' MIME header is not included in that block's MIME part.

The entire MIME container, from the opening mime tag to the closing, has it's
'Content-Type:' MIME header set to 'multipart/mixed'.

For example, the following DTML::

  <!--#mime encode=7bit type=text/plain-->
  This is the first part.
  <!--#boundary encode=base64 type=text/plain-->
  This is the second.

Is rendered to the following text::

  Content-Type: multipart/mixed;

  Content-Type: text/plain
  Content-Transfer-Encoding: 7bit

  This is the first part.

  Content-Type: text/plain
  Content-Transfer-Encoding: base64



The #mime tag is particularly handy in conjunction with the ``#sendmail`` tag.
This allows Zope to send attachments along with email. Here is an example.

Create a DTML method called 'input' with the following code::

  <!--#var standard_html_header-->
  <form method=post action="send" ENCTYPE="multipart/form-data">
  <input type=file name="afile"><br>
  Send to:<input type=textbox name="who"><br>
  <input type=submit value="Send">
  <!--#var standard_html_footer-->

Create another DTML Method called 'send' with the following code::

  <!--#var standard_html_header-->
  <!--#sendmail smtphost=localhost -->
  From: michel@digicool.com
  To: <!--#var who-->
  <!--#mime type=text/plain encode=7bit-->

  Hi <!--#var who-->, someone sent you this attachment.

  <!--#boundary type=application/octet-stream disposition=attachment
  encode=base64--><!--#var "afile.read()"--><!--#/mime-->


  Mail with attachment was sent.
  <!--#var standard_html_footer-->

Notice that there is no blank line between the 'To:' header and the starting
#mime tag. If a blank line is inserted between them then the message will not be
interpreted as multipart by the receiving mail reader.

Also notice that there is no newline between the #boundary tag and the #var tag,
or the end of the #var tag and the closing #mime tag. This is important, if you
break the tags up with newlines then they will be encoded and included in the
MIME part, which is probably not what you're after.

As per the MIME spec, #mime tags may be nested within #mime tags arbitrarily.