Rendering engines are responsible for performing the transformation on a source node to create a rendition. Different rendering engines will perform different types of transformation. They can be registered with the RenditionService using a unique name.
Rendering engine definitions provide a description of a given rendering engine. Each rendering engine definition exposes parameter definitions for all the parameters which can be provided to the associated rendering engine. Each parameter definition describes the parameter name, type and whether or not it is mandatory.
Rendition definitions encapsulate all the necessary information for rendering a given source node into a rendition. This includes the rendering engine, which is used to perform the rendition and all the parameter values specified. Rendition definitions have unique, qualified names and can be persisted within the repository.
Composite rendition definitions are a special type of rendition definition that allows the creation of renditions that require a sequence of two or more transformation steps. For example, a composite rendition definition could be used to first reformat a PDF document into a PNG image and then resize the image to a small thumbnail. Composite rendition definitions specify an ordered list of other rendition definitions to be sequentially executed, with the output of the previous transformation feeding in as the source node for the next definition. All composite rendition definitions specify the composite rendering engine for their transformations.
Available rendering engines include:
- Base rendering engine
- Reformat rendering engine
- Image rendering engine
- FreeMarker rendering engine
- XSLT rendering engine
- HTML rendering engine
- Composite rendering engine