Insert citation with VisualEditor for "http://chroniclingamerica.loc.gov/lccn/sn85040224/"
Result:
"The Daily Palo Alto times.". ISSN None Check |issn= value (help). Retrieved 2015-06-23.
Meta data of the target url:
<meta name="DC.title" content="The Daily Palo Alto times." /> <meta name="DC.publisher" content="Times Pub. Co." /> <meta name="DC.issued" content="1905/1943" /> <meta name="DC.identifier" content="info:lccn/sn85040224" /> <meta name="DC.identifier" content="info:oclcnum/11682912" /> <meta name="DC.identifier" content="urn:issn:None" /> <meta name="DC.type" content="text" /> <meta name="DC.subject" content="California--Palo Alto.--fast--(OCoLC)fst01212098" /> <meta name="DC.subject" content="Palo Alto (Calif.)--Newspapers." /> <meta name="DC.language" content="eng" /> <link title="MODS Metadata Schema" rel="schema.mods" href="http://www.loc.gov/standards/mods/mods.xsd" /> <meta name="mods.title" content="The Daily Palo Alto times." /> <meta name="mods.place" content="Palo Alto, Calif." /> <meta name="mods.place" content="California--Santa Clara--Palo Alto" /> <meta name="mods.url" content="http://chroniclingamerica.loc.gov/lccn/sn85040224/" /> <meta name="mods.issn" content="None" /> <meta name="mods.lccn" content="sn85040224" /> <meta name="mods.languageTerm" content="eng" /> <meta name="citation_title" content="The Daily Palo Alto times." /> <meta name="citation_issn" content="None" />
While it is unfortunate, it seems not uncommon for loc.gov to output these kind of values. It produces a user-visible error (surfaced through the template parsing preview), but not a native VE error and it will make its way into page content when saved as-is without looking carefully at the preview.
