- added comment for SRU specification

bin/slubsipbuilder.pl

@@ -167,6 +167,7 @@ PATCH2
     return $result;
 }
 
+# specification SRU/SRW BSZ: https://wiki.k10plus.de/pages/viewpage.action?pageId=132874251
 sub get_mods_from ($$$$) { # $mods = ($url, $ppn, $searchkey, $recordschema)
     my $url = shift;
     my $ppn = shift; # example: "457035137"  for "Der Fichtelberg"