Character position definition and scope:

A one-character alphabetic code indicates the positive/negative aspect of the microform.  This characteristic is also referred to as the polarity.  A fill character ( | ) is used when no attempt has been made to code this position.

Record requirements for National-level and Minimal-level records:  Optional.

Guidelines for applying content designators:

To return, select:

007:  Microform

007  Physical Description Fixed Field