You can identify a node by giving it a URI, specified in the @id
keyword. This URI can be used to reference that node.
See the section “Node Identifiers” in the JSON-LD spec.
So your main event could get the URI http://example.com/2016-04-21#main-event
:
<script type="application/ld+json">
{
"@id": "http://example.com/2016-04-21#main-event",
"@context": "http://schema.org",
"@type": "Event",
"name": "MainEvent",
"startDate": "2016-04-21T12:00"
}
</script>
and you could give this URI as the value for the sub event’s superEvent
property:
<script type="application/ld+json">
{
"@context": "http://schema.org",
"@type": "Event",
"name": "SubEvent",
"startDate": "2016-04-21T12:00",
"superEvent": { "@id": "http://example.com/2016-04-21#main-event" }
}
</script>
(You could of course give your sub event an @id
, too. This would allow you and others to identify/reference this sub event.)