[Some "xmlns","m","http://www.w3.org/1998/Math/MathML" ;
Some "xmlns","helm","http://www.cs.unibo.it/helm" ;
Some "xmlns","xlink","http://www.w3.org/1999/xlink"
[Some "xmlns","m","http://www.w3.org/1998/Math/MathML" ;
Some "xmlns","helm","http://www.cs.unibo.it/helm" ;
Some "xmlns","xlink","http://www.w3.org/1999/xlink"