[Monetdb-developers] An XQuery question

Dear developers, If I run the follwoing XQuery query with Galax: ========== test.xq ========== declare namespace t = "test"; declare function t:echoVoid() { () }; t:echoVoid() ========== Galax gives a warning: $ galax-run ~/test.xq [WARNING] Expression '???' at File "/ufs/zhang/test.xq", line 3, characters 8-37 has empty type, but is not the empty expression () Does any one have an idea how I can correct/modify my query to get rid of this warning? Thanks in advance! Jennie