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The validate method is not always implemented, but can and should be when a mechanism exists to insure that this is a correctly structured version of the source.  When source is XML formatted and has a schema or dtd document commonly available for validation, this is a relatively easy process.  However any free text files that do not have any associated java-based validation API, would rely on the developer to create validation functions.  This method is not required to create a loader for LexEVS. 

In theory the developer could at this point implement only doLoad() by mapping content to a coding scheme object and turning control over to BaseLoader which will call this method and set default load options in its load method.  The other option is to implement doLoad and override the load method which sets up end user option choices for the loader.   Most loaders implement the load method, customizing load options to provide to the end user.  In the case of the MedDRA loader, a CUI load option is provided to the end user of the loader.