hasTimespan.begin.isImprecise is missing in schema and in chronontology documentation
schema needs to include possible key "isImprecise" for hasTimespan.begin and hasTimespan.end.
value is boolean
example: "Khartoum Mesolithic"
"id": "0zM9nYVACoXH",
"hasTimespan": [
{
"timeOriginal": "date from 8000 BCE to 4900 BCE.",
"begin": {
"at": "-8000",
"isImprecise": true
},
"end": {
"at": "-4900",
"isImprecise": true
}
}
]