MrpResource represents a resource in the project. A private struct for internal use only. The definition of this structure is not publically available. Object representing a task in the project. @mrpresource: the object which received the signal. @arg1: @mrpresource: the object which received the signal. @arg1: The type of the resource, work or material. @MRP_RESOURCE_TYPE_NONE: invalid type (unset) @MRP_RESOURCE_TYPE_WORK: work resource @MRP_RESOURCE_TYPE_MATERIAL: material resource @Returns: @resource: @Returns: @resource: @name: @resource: @task: @units: @resource: @Returns: @resource: @Returns: @a: @b: @Returns: @resource: @Returns: @resource: @calendar: