# File lib/addressable/uri.rb, line 794
    def scheme=(new_scheme)
      if new_scheme && !new_scheme.respond_to?(:to_str)
        raise TypeError, "Can't convert #{new_scheme.class} into String."
      elsif new_scheme
        new_scheme = new_scheme.to_str
      end
      if new_scheme && new_scheme !~ /[a-z][a-z0-9\.\+\-]*/i
        raise InvalidURIError, "Invalid scheme format."
      end
      @scheme = new_scheme
      @scheme = nil if @scheme.to_s.strip.empty?

      # Reset dependant values
      @normalized_scheme = nil
      @uri_string = nil
      @hash = nil

      # Ensure we haven't created an invalid URI
      validate()
    end