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[
{
"operation": "cardinality",
"spec": {
"views": {
"@": "ONE",
"count": "MANY"
}
]
//在cardinality场景，@用于声明当前层级的基数规则
//作为特殊键名"@"出现，值为基数规则（"ONE"或"MANY"），通常位于嵌套对象内部