Delete operation using swordfish schema

The use cases documented in the specification are examples of how the schema may be used, they are not meant to describe all possibilities.
As specified in clause 5.1 Introduction, Swordfish extends the Redfish Scalable Platforms Management API Specification (DSP0266) from the DMTF.
That specification documents the use of Delete relative to Resource Collections in general. This applies to Volume Collection, which is based on the Resource Collection declaration. For more information, see DSP0266, clause 6.4.4.6. Delete.