code: protected void validate(String operationType) throws Exception
  	{
  		super.validate(operationType);
  
  		MPSString image_name_validator = new MPSString();
  		image_name_validator.setConstraintIsReq(MPSConstants.GENERIC_CONSTRAINT, true);
  		image_name_validator.setConstraintMaxStrLen(MPSConstants.GENERIC_CONSTRAINT, 128);
  		image_name_validator.setConstraintMinStrLen(MPSConstants.GENERIC_CONSTRAINT, 1);
  		image_name_validator.validate(operationType, image_name, "\"image_name\"");
  		
  		MPSString doc_file_validator = new MPSString();
  		doc_file_validator.setConstraintMaxStrLen(MPSConstants.GENERIC_CONSTRAINT, 128);
  		doc_file_validator.setConstraintMinStrLen(MPSConstants.GENERIC_CONSTRAINT, 1);
  		doc_file_validator.validate(operationType, doc_file, "\"doc_file\"");
  		
  	}
docs: <pre>
  Performs generic data validation for the operation to be performed
  </pre>