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Reason: in this DM, the representations of “Description” and “Instance” objects are distinguished very clearly: the ETSI “Descriptions” are modelled as node types, while their “Instances” are modelled as node templates (ref to the Patterns section). Therefore, there is no need to overload type names with unnecessary postfixes.
lishitao : The suggestion is fine, but the reason is a little bit confuse, in TOSCA ,
A Node Type is a reusable entity that defines the type of one or more Node Templates.
A Node template is an instance of a specified Node Type and can provide customized properties, constraints or operations which override the defaults provided by its Node Type and its implementations.
while in ETSI NFV, "descriptor" is a concept in the design mode, "instance" is a concept of runtime model.