This query doesn't work because the serializer of the query result throws an error. The result of a query must not be an attribute. fn:trace does work on my side:
./bin/zorba -q 'trace(attribute { "a" } { 1 }, "a")' a [1]: a="1" <========== fn:trace print <?xml version="1.0" encoding="UTF-8"?> serialization error [err:SENR0001]: "1": can not serialize attribute node; raised at /home/dagraf/zorba/sandbox/src/api/serialization/serializer.cpp:456 You need to execute something like: ./bin/zorba -q 'data(trace(attribute { "a" } { 1 }, "a"))' ... to not see an error. -- https://code.launchpad.net/~davidagraf/zorba/fn_trace_jsoniq_fix/+merge/119478 Your team Zorba Coders is subscribed to branch lp:zorba. -- Mailing list: https://launchpad.net/~zorba-coders Post to : zorba-coders@lists.launchpad.net Unsubscribe : https://launchpad.net/~zorba-coders More help : https://help.launchpad.net/ListHelp