title: is there a canonical way to grab all idents from a particular datomic namespace?
body: <p>say I had <code>:user/name</code> and <code>:user/gender</code> installed as datomic schema.</p>
  
  <pre><code>(pprint (d/q '[:find ?ident :where
                 [?e :db/ident ?ident]
                 [_ :db.install/attribute ?e]] (d/db conn)))
  </code></pre>
  
  <p>finds all the db.install/attributes</p>
  
  <pre><code> #{[:db/code] [:user/gender] [:fressian/tag] [:db/unique] [:user/name] [:db/fn] 
   [:db/noHistory] [:db/fulltext] [:db/lang] [:db/valueType] [:db/doc]
   [:db/isComponent] [:db.install/function] [:db/cardinality] [:db/txInstant] [:db/index]}
  </code></pre>
  
  <p>however, I only want to list items in the :user namespace</p>
  
  <pre><code>[:user/gender] [:user/name]
  </code></pre>
  
  <p>what should I add to the query or is there a function that does it automatically?</p>