Content Type

AKA:

• HTTP Content-Type - this is the preferred terminology, especially as it emphasizes the content aspect.
• MIME type. This terminology is deprecated.
• media type. Recommend AGAINST using the term "media type" to refer to content-type as it is overloaded, and often (even more often among web design circles) used to refer to CSS media types.

In microformats, as elsewhere, it is good practice to use a content-type attribute when linking to audio files, PDF files, and other attachments.