We could add @vholland 's original example:
{
"@context": "http://schema.org/",
"@type": "Article",
"name": "Apple announces iPhone SE",
"description": "New iPhone announced at 11:30 in California.",
"about": {
"@type": "Event",
"name": "Apple's March 21 Announcements"
},
"contentReferenceTime": "2016-03-21T11:30:00-07:00"
}
