def delete_tag(tag)
      raise ArgumentError, "Expected String, got #{tag.class}." unless tag.is_a?(String)
      raise ArgumentError, "Expected a valid tag of format 'GGGG,EEEE', got #{tag}." unless tag.tag?
      @delete[tag] = true
    end
def delete_tag(tag)
      raise ArgumentError, "Expected String, got #{tag.class}." unless tag.is_a?(String)
      raise ArgumentError, "Expected a valid tag of format 'GGGG,EEEE', got #{tag}." unless tag.tag?
      @delete[tag] = true
    end
Specifies that the given tag is to be completely deleted
 from the anonymized DICOM objects.

 @param [String] tag a data element tag
 @example Completely delete the Patient's Name tag from the DICOM files
   a.delete_tag('0010,0010')