# File lib/math_ml/latex.rb, line 366
                        def initialize(opt={})
                                @unsecure_entity = false
                                @entities = Hash.new
                                @commands = Hash.new
                                @symbols = Hash.new
                                @delimiters = Array.new
                                @group_begins = Hash.new
                                @group_ends = Hash.new
                                @macro = Macro.new
                                @macro.parse(BUILTIN_MACRO)
                                @expanded_command = Array.new
                                @expanded_environment = Array.new
                                @symbol_table = opt[:symbol] || MathML::Symbol::Default
                                @symbol_table = MathML::Symbol::MAP[@symbol_table] if @symbol_table.is_a?(::Symbol)

                                super()
                        end