问题
As far as I understand it, a transformation chain is filled with transforms after calculating the shortest path between original and target mimetypes (see convertTo() and _findPath() in Products.PortalTransforms.TransformEngine).
How can I hook a transformation in the transformation chain.
Are there maybe other means to hook a transformation?
If yes are there some example or documentation?
来源：https://stackoverflow.com/questions/24222774/how-can-i-hook-a-transformation-in-the-transformation-chain