Check Publisher number (028$a): This crosscheck extracts and checks all occurrences of 028$a; if any two numbers match, the others are discarded and the crosscheck passes; this crosscheck will be run only on Audio/Visual items (record types c,d,g,i,j,k,o,r)
Normalization: shift to uppercase, replace dashes with blanks, close-up double blanks, ignore any data in parens or brackets.
A missing 028$a will not fail the match