Changes

It is not possible to mix different types of expressions in a query result. The outermost expression of a query must either be a collection of updating or non-updating expressions. Generally there is no way to perform any updating queries and return a result at the same timeas you cannot access your own changes during a single query. But Regarding database nodes, dividing a single query into an updating and a simple non-updating query solves this issue. Trying to modify and convenient workaround existsreturn a DOM node within the same snapshot is another story. common error: copy/fragment of dbnodeAs changes on DOM nodes are non-> change for resultpersistant, you cannot access them in a subsequent query. better use This is where the transformexpression comes into play.