public function setOptions($options = array()){

		$this->options = array_merge($this->options, $options);

		$this->xmlDocument->defs[0]->font[0]['id'] = $this->options['id'];
		$this->xmlDocument->defs[0]->font[0]['horiz-adv-x'] = $this->options['horiz-adv-x'];
		$this->xmlDocument->defs[0]->font[0]->{'font-face'}[0]['units-per-em'] = $this->options['units-per-em'];
		$this->xmlDocument->defs[0]->font[0]->{'font-face'}[0]['ascent'] = $this->options['ascent'];
		$this->xmlDocument->defs[0]->font[0]->{'font-face'}[0]['descent'] = $this->options['descent'];
		$this->xmlDocument->defs[0]->font[0]->{'font-face'}[0]['x-height'] = $this->options['x-height'];
		$this->xmlDocument->defs[0]->font[0]->{'font-face'}[0]['cap-height'] = $this->options['cap-height'];
		$this->xmlDocument->defs[0]->font[0]->{'missing-glyph'}[0]['horiz-adv-x'] = $this->options['horiz-adv-x'];

	}