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The agent for each type of resource requires a resource type definition that describes the information an agent needs to control resources of that type. The type definition can be considered similar to a header file in a C program. The type definition defines the data types of variables (attributes) to provide error checking, and to provide default values for certain attributes for the entire type.
All resource types need definition. One of the attributes that is defined for the IP resource type is the IPAddress attribute, which stores the actual IP address of a specific IP resource. This attribute is defined as a 'string-scalar' as the use of periods to denote an IP address makes the acceptable values for the attribute a string.