docs: def run(self):
          """ Run at parse time.
  
          When the documents are initially being scanned, this method runs
          and does two things: (a) creates an instance that is added to
          the site's widgets, and (b) leaves behind a placeholder docutils
          node that can later be processed after the docs are resolved.
          The latter needs enough information to retrieve the former.
  
          """
  
          rtype = self.name
          resource_content = '\n'.join(self.content)
          resource_class = ResourceDirective.get_resource_class(rtype)
          this_resource = resource_class(self.docname, rtype, resource_content)
  
          # Add this resource to the site
          self.resources[this_resource.docname] = this_resource
  
          # Don't need to return a resource "node", the document is the node
          return []