langchain/document_loaders/blackboard.py/BlackboardLoader/_get_documents
class BlackboardLoader:    def _get_documents(self, soup: Any) -> List[Document]:
        """Fetch content from page and return Documents.

        Args:
            soup: BeautifulSoup4 soup object.

        Returns:
            List of documents.
        """
        attachments = self._get_attachments(soup)
        self._download_attachments(attachments)
        documents = self._load_documents()
        return documents