private function _getConvertingDictionary ( ) {
        $definedColors = DecorationsObject::getDefinedColors();
        foreach ( $definedColors as $colorName => $escapeSequences ) {
            list($textColorEscapeSequence, $backgroundColorEscapeSequence) = $escapeSequences;
            $patterns[] = "|<tc:$colorName>|";
            $replacements[] = $textColorEscapeSequence;
            $patterns[] = "|<bc:$colorName>|";
            $replacements[] = $backgroundColorEscapeSequence;
        }

        $resetEscapeSequences = $definedColors['reset'];
        $patterns[] = '|</tc>|';
        $replacements[] = $resetEscapeSequences[0];
        $patterns[] = '|</bc>|';
        $replacements[] = $resetEscapeSequences[1];

        $definedStyles = DecorationsObject::getDefinedStyles();
        $resetEscapeSequence = $definedStyles['reset'];
        foreach ( $definedStyles as $styleName => $escapeSequence ) {
            $patterns[] = "|<$styleName>|";
            $replacements[] = $escapeSequence;
            $patterns[] = "|</$styleName>|";
            $replacements[] = $escapeSequence;
        }

        $dictionary = array($patterns, $replacements);
        return $dictionary;
    }