Comment 1 for bug 1584090

I note that OCLC has a special Z39.50 use attribute, 1019, that if set to 'y', *restricts* search results to DLC records. Would this be more or less useful than highlighting DLC records in search results?

As far as highlighting records is concerned, should that be based on the presence of "DLC" in the 040 $a or $c? What about if there's a $d with "DLC"?

[1] https://www.oclc.org/support/services/firstsearch/documentation/z3950/z3950_databases/specs/worldcat.en.html