Should the array acts like programming language array?

Hi All, 

Since there are voltage sensors in a Power resource. 

If there's only one sensor in the Voltages array, could it be any kind of unique string instead of a number sequence?

Could it be:

"Voltages": [
{
"@odata.id": "xxxxxxxxxxx#/Voltages/3",
"MemberId": "3".

or

"Voltages": [
{
"@odata.id": "xxxxxxxxxxx#/Voltages/3V",
"MemberId": "3V".

instead of 

"Voltages": [
{
"@odata.id": "xxxxxxxxxxx#/Voltages/0",
"MemberId": "0".



There is an example in the Redfish Spec. as follow:

If a property in a response is a reference to another property within a resource, the "URI Fragment
Identifier Representation" format as specified in RFC6901 shall be used. If the property is defined as a
reference property within the schema, the fragment shall reference a valid resource identifier. For
example, the following fragment identifies a property at index 0 of the Fans array within the resource
/redfish/v1/Chassis/MultiBladeEncl/Thermal:


{
"@odata.id": "/redfish/v1/Chassis/MultiBladeEncl/Thermal#/Fans/0"
}


IMO this does not imply that it should be started with 0, but the others have different opinion with me, is there any documentation about this?
I think I am right but this does confuse some others. 

Many thanks.