Frequently on a project, a key artifact for the team to review or to capture for historical or audit purposes could be a web page (internal or external). Examples of this could be capturing a link to a product feature or support page, Gartner research, or document management systems that can link to document via a URL (exposing our DMS via API to a cloud service would be prohibited by our clients). Documents should be the repository for any key artifacts of a project and URLs are frequently artifacts.