Swordfish question on StorageGroups

I am new to redfish and swordfish. Not sure if this is the site to post Swordfish related questions. In trying to understand the swordfish schema, I was going through the mockups posted on SNIA. The StorageGroup schema points to a volume collection. However, one mockup shows a list of volumes while the other shows a collection of volumes. I presume the latter is correct? See relevant cut pastes below- 

/redfish/v1/StorageServices/FileService/Storage/StorageGroups/1 :-

"@odata.context": "/redfish/v1/$metadata#StorageGroup.StorageGroup",

"@odata.id": "/redfish/v1/StorageServices/FileService/Storage/StorageGroups/1",

"@odata.type": "#StorageGroup_1_0_0.StorageGroup",

...

"Volumes": [

{

"@odata.id": "/redfish/v1/StorageServices/FileService/Volumes/61001234876545676100123487654567"

},

{

"@odata.id": "/redfish/v1/StorageServices/FileService/Volumes/65456765456761001234876100123487"

}

],

...



Whereas /redfish/v1/StorageServices/1/StorageGroups/1 shows a volume collection :- 
"@odata.context": "/redfish/v1/$metadata#StorageGroup.StorageGroup/1",

"@odata.id": "/redfish/v1/StorageServices/1/StorageGroups/1",

"@odata.type": "#StorageGroup_1_0_0.StorageGroup",

...
"Volumes": {"@odata.id": "/redfish/v1/StorageServices/1/Volumes"},

...