I have the following query that works in datomic

(d/q '[:find [(pull ?e [*]) ...]
         :in $ ?prefix
         :where
         [?e :db/ident ?attr]
         [(namespace ?attr) ?ns]
         [(= ?ns ?prefix)]
         ]
       db prefix)

but it fails with datascript saying "Unknown function 'clojure.core.namespace in [(clojure.core.namespace ?attr) ?ns]"

can I use the namespace function like that ?