The following screenshot shows how a multipart-alternative message may be
constructed. Each part inside the body has a Content ID or Content Location that is
used to refer to that file in the presentation.
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Adding Spice to Messages: MMS
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The message type, recipient addresses, and subject that we entered in the example
above go in the MMS headers. If you noticed, you could enter your own headers or
modify some default values for headers in the NMIT MMS composer. One header
you may like to know about is "X-Mms-Message-Class". This header determines the
type of message, and the value could be Personal, Advertisement, Informational, or
Auto. Use an appropriate value for your messages.
The SMIL file that NMIT automatically generated is an XML file that defines how the
logo and special offer text would be placed. We will look at SMIL in a bit more detail
later in the chapter.
When you clicked the Push button, NMIT encoded all the content together in a
binary format and sent it to the Content Authoring SDK. Unlike emails, you can't see
the body of an MMS message with a text editor. There are set standards about how
the headers should be constructed and how different elements should be referenced.
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