Check if the site contains a meta-tag which contains
        property="og:type" and content="article"

        :param obj response: The scrapy response
        :param dict site_dict: The site object from the JSON-File

        :return bool: True if the tag is contained.

def og_type(response, site_dict):
        """
        Check if the site contains a meta-tag which contains
        property="og:type" and content="article"

        :param obj response: The scrapy response
        :param dict site_dict: The site object from the JSON-File

        :return bool: True if the tag is contained.
        """
        og_type_article = response.xpath('//meta') \
            .re('(property=["\']og:type["\'].*content=["\']article["\'])|'
                '(content=["\']article["\'].*property=["\']og:type["\'])')
        if not og_type_article:
            return False

        return True