//Exception:Definitions must define a single Group child node.
throw new FXGException(node.getStartLine(), node.getStartColumn(), "MissingGroupChildNode");
}
spriteStack.push(definitionSprite);
if (groupDefinition.definesScaleGrid())
{
definitionSprite.scalingGrid = createDefineScalingGrid(groupDefinition.getScalingGrid());
definitionSprite.scalingGrid.scalingTarget = definitionSprite;
}