path	value/explanation	url	count
invalid value (1 variant(s))			1
Leader/05 (leader05)	" "		1
undefined subfield (4 variant(s))			4
886	k		1
886	h		1
886	x		1
886	z		1
repetition of non-repeatable subfield (1 variant(s))			1
886$a	there are multiple instances		1
invalid ISBN (1 variant(s))			1
020$a	ISBN is not a valid ISBN 10 value		1