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Note: The following is an excerpt from the official IETF RFC. It is provided here as a convenience and is not authoritative. Refer to the original document as the authoritative reference.

 The [MIME-DIR] document defines a MIME Content-Type for holding
 different kinds of directory information. The directory information
 can be based on any of a number of directory schemas. This document
 defines a [MIME-DIR] usage profile for conveying directory
 information based on one such schema; that of the white-pages type of
 person object.

 The schema is based on the attributes for the person object defined
 in the X.520 and X.521 directory services recommendations. The schema
 has augmented the basic attributes defined in the X.500 series
 recommendation in order to provide for an electronic representation
 of the information commonly found on a paper business card. This
 schema was first defined in the [VCARD] document. Hence, this [MIME-
 DIR] profile is referred to as the vCard MIME Directory Profile.

 A directory entry based on this usage profile can include traditional
 directory, white-pages information such as the distinguished name
 used to uniquely identify the entry, a formatted representation of
 the name used for user-interface or presentation purposes, both the
 structured and presentation form of the delivery address, various
 telephone numbers and organizational information associated with the
 entry. In addition, traditional paper business card information such
 as an image of an organizational logo or identify photograph can be
 included in this person object.

 The vCard MIME Directory Profile also provides support for
 representing other important information about the person associated
 with the directory entry. For instance, the date of birth of the
 person; an audio clip describing the pronunciation of the name
 associated with the directory entry, or some other application of the
 digital sound; longitude and latitude geo-positioning information
 related to the person associated with the directory entry; date and
 time that the directory information was last updated; annotations
 often written on a business card; Uniform Resource Locators (URL) for
 a website; public key information. The profile also provides support
 for non-standard extensions to the schema. This provides the
 flexibility for implementations to augment the current capabilities
 of the profile in a standardized way.