bool CMarkup::RemoveChildAttrib( MCD_CSTR szAttrib );

RemoveChildAttrib is only in CMarkup Developer and the free XML editor  FOAL C++ scripting.

Call RemoveChildAttrib to remove the attribute named szAttrib in the child position element. The method returns false if there is no child position or attribute by this name.

See also the SetChildAttrib and RemoveAttrib methods.