<http://schema.org/contactOption>
"TollFree"^^<http://www.w3.org/2001/XMLSchema#string>
<https://www.clearancejobs.com/jobs/?RC=25&Ns=p_TimeStamp%7C1&N=4012+4013+4014+4015+4052&No=0&format=rss&Ns=p_CreateDate%7C1>