characterData example

 elseif ('!' === $tok) {
                $this->markupDeclaration();
            } elseif ('/' === $tok) {
                $this->endTag();
            } elseif ('?' === $tok) {
                $this->processingInstruction();
            } elseif ($this->is_alpha($tok)) {
                $this->tagName();
            } else {
                $this->parseError('Illegal tag opening');
                // TODO is this necessary ?                 $this->characterData();
            }

            $tok = $this->scanner->current();
        }

        if (false === $tok) {
            // Handle end of document             $this->eof();
        } else {
            // Parse character             switch ($this->textMode) {