Status: Stable Attribute An Attribute is a key-value pair, which MUST have the following properties: The attribute key MUST be a non-null and non-empty string. Case sensitivity of keys is preserved. Keys that differ in casing are treated as distinct keys. The attribute value is either: A primitive type: string, boolean, double precision floating point (IEEE 754-1985) or signed 64 bit integer. An array of primitive type values. The array MUST be homogeneous, i.
