def valid?
      return false if @name.nil?
      return false if @document_type.nil?
      document_type_validator = EnumAttributeValidator.new('String', ["pdf", "xls", "xlsx"])
      return false unless document_type_validator.valid?(@document_type)
      return false if @document_content.nil?
      strict_validator = EnumAttributeValidator.new('String', ["none"])
      return false unless strict_validator.valid?(@strict)
      return true
    end
def valid?
      return false if @name.nil?
      return false if @document_type.nil?
      document_type_validator = EnumAttributeValidator.new('String', ["pdf", "xls", "xlsx"])
      return false unless document_type_validator.valid?(@document_type)
      return false if @document_content.nil?
      strict_validator = EnumAttributeValidator.new('String', ["none"])
      return false unless strict_validator.valid?(@strict)
      return true
    end
Check to see if the all the properties in the model are valid
 @return true if the model is valid