Hi all, Apologies for missing the telcon this week due to other work pressures. I haven't made much progress with any implementation, but have been taking a look at the Defuddle code. I have some questions that someone may be able to answer, and a few thoughts for discussion. The current Defuddle implementation is based upon JAXME, the Java/XML binding implementation. Presumably JAXME is used to generate an object model representation of the data format described by the DFDL schema. And then, I think the underlying data stream would be marshaled into an instance of that object model. Is this understanding correct? If my understanding is correct, I'm concerned that this approach may not be suitable for large data streams, since the entire object model instance would probably have to be assembled and stored in memory, like a DOM tree. Has anybody considered using a streamed pull-parsing approach instead, based upon or similar to StAX (Streaming API for XML)? I was thinking along the lines of parsing the DFDL schema into DOM or some other internal representation. Then pull-parsing the data stream, producing a sequence of StAX-like events corresponding to the data in the stream and its structure. During the pull-parsing, the context would need to be maintained and the conversion algorithm used for transforming parts of the data stream into values of the correct type. These values would then be wrapped in corresponding event objects. If this approach was viable, then these StAX-like APIs could be used to implement higher-level applications or APIs. For instance, it would be straight-forward to produce an XML serialization of any data described by a DFDL schema. One could also imagine binding any data described by a DFDL schema to auto-generated Java beans, or to a DOM object, when desirable. The process may even be reversible, so that data could be written back to a data stream as well as being read from one. I haven't thought this through very deeply yet and my understandings of the issues are still quite naive, so I will be very interested to hear any comments. Sorry if this avenue has already been explored, or I've misunderstood the mechanics of Defuddle or JAXME. Cheers, Tom