Metadata modified by information.
{ "modified" : { "@type" : "Modified", "organization" : { "@id" : "URL", "@type" : "Organization", "elementId" : "String", "name" : "String" }, "person" : { "@id" : "URL", "@type" : "Person", "elementId" : "String", "name" : "String" }, "timeStamp" : "Datetime" } }