The page root query
To fetch a Page, you must identify its namespace (1 for Tridion Sites, 2 for Tridion Docs), Publication ID, and either its Page ID or relative URL.
The following
page call fetches a Page using the identifiers of its namespace, Publication, and the relative URL of the webpage corresponding to this Page on the published website:
page(namespaceId: 2, publicationId: 26, url: "/pressreleases/index.html")
The above call fetches the Page corresponding to the URL http://www.example.com/pressreleases/index.html (where http://www.example.com is the published website) from the Tridion Docs Publication with ID 26.
page(cmUri: "ish:16-984-64")
The above call fetches the Page with the Tridion Docs Content Manager URI ish:16-984-64, which uniquely identifies the item.