Shale is a Ruby object mapper and serializer for JSON, YAML and XML. It allows you to parse JSON, YAML and XML data and convert it into Ruby data structures, as well as serialize data structures into JSON, YAML or XML.
Declarative Stream Mapping (DSM) is a stream de/serializer library for XML and JSON. DSM allows you to make custom parsing, filtering, transforming, aggregating, grouping on any JSON or XML document at stream time(read only once).