ok thx problem solved :)i read name/temat/predykat/object from TextField, validate it and when temat/obiekt be blank node i replace it for ?a/?c and it works :)
code below
query= " WITH " + name+
" DELETE " +
" { "+
temat + " " + predykat + " " +obiekt+ " " +
" } " +
" WHERE " +
" { "+
temat + " " + predykat + " " +obiekt+ " " +
" } ";-- Pozdrawiam Wojciech Ciesielski
