Subfield $1 contains a URI that identifies a description of an entity, sometimes referred to as a Thing, a Real World Object or RWO, whether actual or conceptual.  When dereferenced, the URI points to a description of that entity.  A URI that identifies a name or label for an entity is contained in $0.


100  1#  $aObama, Michelle,$d1964-$0$1

100  1#  $aSanta Claus$0$1

700  1#  $aJemison, Mae,$d1965-$0$1

See also:

Appendix A:  Control Subfields