1.0.2 `om_xml'
--------------

om_xml(S|proc=P)
     ::  Translate CMO expression of  S to a XML expression of
     OpenMath(CD's in 1999).

RETURN
     String

P
     Number

S
     Object

   * Translate CMO S to a XML expression of OpenMath(CD's in 1999).

     For (I=0; I<10; I++) {
        A = 2^I;
        B = om_xml(A);
        C = om_xml_to_cmo(B);
        print(A == C);
     }

