'title' => The title to display. 'description' => Description to display. 'keyword' => Default keyword for the context created by this relationship. 'required context' => One or more ctools_context_required/optional objects describing the context input. new panels_required_context(t('Node'), 'node'), 'context' => The callback to create the context. Params: ($context = NULL, $conf) 'settings form' => Settings form. Params: $conf 'settings form validate' => Validate.