code: def check_known_schemas(self):
          
          if 'image' in self.article.opengraph:
              return self.get_image(self.article.opengraph["image"],
                                    extraction_type='opengraph')
          elif (self.article.schema and 'image' in self.article.schema and
                "url" in self.article.schema["image"]):
              return self.get_image(self.article.schema["image"]["url"],
                                    extraction_type='schema.org')
          return None
docs: \
          checks to see if we were able to find the image via known schemas:
  
          Supported Schemas
           - Open Graph
           - schema.org