code: @Override
      protected void initializeTokenStream( DdlTokenStream tokens ) {
          super.initializeTokenStream(tokens);
          tokens.registerKeyWords(CUSTOM_KEYWORDS);
          tokens.registerStatementStartPhrase(ALTER_PHRASES);
          tokens.registerStatementStartPhrase(CREATE_PHRASES);
          tokens.registerStatementStartPhrase(DROP_PHRASES);
          tokens.registerStatementStartPhrase(SET_PHRASES);
          tokens.registerStatementStartPhrase(MISC_PHRASES);
      }
docs: {@inheritDoc}
  
  @see org.modeshape.sequencer.ddl.StandardDdlParser#initializeTokenStream(org.modeshape.sequencer.ddl.DdlTokenStream)