Sling Resource Merger in AEM

The Sling Resource Merger provides services to access and merge resources. It provides diff (differencing) mechanisms for both:

• Overlays of resources using the configured search paths.
• Overrides of component dialogs for the touch-optimized UI (cq:dialog), using the resource type hierarchy (by means of the property sling:resourceSuperType).

With the Sling Resource Merger, the overlay/override resources and/or properties are merged with the original resources/properties:

• The content of the customized definition has a higher priority than that of the original (i.e. it overlays oroverrides it).
• Where necessary, properties defined in the customization, indicate how content merged from the original is to be used.