In one embodiment, one or more data structures that define associations between a plurality of configuration keys and a plurality of configuration values are accessed, and a highest priority configuration value is retrieved for each of the plurality of configuration keys. The configuration values are stored in the data structure in one or more of a plurality of configuration layers, with each of the configuration layers conferring a priority to the configuration values stored therein. Configuration values for at least some of the configuration keys are simultaneously specifiable in multiple ones of the configuration layers. A data formatting process is configured in accord with the retrieved configuration values for the configuration keys. Other embodiments are also disclosed.