code: public boolean removeVariable(String attribute, String varName) {
  	Bindings binds = rslTree.getBindings(attribute);
          if (binds == null) return false;
  	return binds.removeVariable(varName);
      }
docs: Removes a specific variable definition given a variable name.
  
  @param attribute the attribute that defines variable definitions.
  @param varName the name of the variable to remove.
  @return true if the variable was successfully removed. Otherwise,
  returns false,