query GuidelineNavigationItemChildren {
  guidelineNavigationItem(id: "…") {
    ... on GuidelineDocumentGroupNavigationItem {
      children(limit: 25, page: 1) {
        items {
          ... on GuidelineDocumentLibraryNavigationItem {
            __typename
            id
            isHiddenInNavigation
            title
            url
          }
        }
      }
    }
  }
}