{url-hash}: the hash of the URL (e.g. "chapter-2")
{digest-sha-256}: the SHA-256 hash value of the entire page content (e.g. e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855)
{digest-sha-384}: the SHA-384 hash value of the entire page content
{digest-sha-512}: the SHA-512 hash value of the entire page content