UserPropertyDefnHandle propDefn = handle .getUserPropertyDefnHandle( name );  if ( propDefn == null ) { addUserProperty( name, IPropertyType.EXPRESSION_TYPE_NAME ); } else if ( propDefn.getType( ) != IPropertyType.EXPRESSION_TYPE ) return;
	public void setNamedExpression( String name, String exp )			throws ScriptException	{		// TODO: We need to keep named expressions and other user properties		// separate?		setUserProperty( name, exp );	}