Specifies meta-information about the parent element
type. Restrictions: When specified in the Chal, the element type
specifies meta-information about the authentication scheme requested.
When specified in the Cred, the element type specifies meta-information
about the authentication credential. When specified in the Atomic,
Sequence and Sync, then the scope for the meta-information includes all
the contained commands, unless the meta-information is overridden by a
Meta in a contained command. When specified in the Results, the element
type specifies meta-information about the results set. When specified in
the Add, Copy, Delete, Get, and Replace commands, the element type
specifies meta-information about the SyncML command.