Character position definition and scope:

A one-character alphabetic code indicates whether or not subtitles and/or supertitles are available at the community information entity to accommodate people with disabilities.

Guidelines for applying content designators:

Code:

Description:

a

No subtitles or supertitles

b

Subtitles and supertitles

c

Subtitles only

d

Supertitles only

n

Not applicable

u

Unknown

See also:

007  Physical Description Fixed Field

Variable Control Fields