Santiago Pericas-Geertsen's Blog

W3C Efficient XML Interchange Public Draft Available

I'm a few days late in reporting that the first public working draft of the Efficient XML Interchange (EXI) format is now available from W3C. And, naturally, the "binary XML" threads have resumed on xml-dev and in a few other places. Without trying to address all the questions raised in those threads, I'll talk about how EXI compares to Fast Infoset.

Rather than going throw all the features in EXI, and given that I have participated in both Fast Infoset (FI) and EXI working groups, let me talk about the differences and similarities between these formats. First, Fast Infoset was in fact one the candidates submitted to the EXI WG for consideration. Although regarded as a strong format in many ways, it was deemed not compact enough for certain use cases. Generally speaking, the more you know about the entity being encoded, the more compact the encoding can be. Thus, knowing that XML (or an XML infoset to be precise) is being encoded helps, but knowing what XML vocabulary (e.g., SVG, XHTML, etc.) is being encoded helps even more. This is why there's is typically a schema mode and a schema-less mode in these type of formats. One of the reasons why EXI can be more compact than FI is due to its stronger support for schemas. In fact, perhaps the best feature of EXI is that it uses essentially the same encoding and decoding algorithm in both modes.

Another reason why EXI can be more compact than FI is that, at least in its default mode of operation, it is bit rather than byte aligned. Thus, in many cases, it can pack more information than FI in a single byte. The downside of bit alignment is that, generally speaking, it requires more CPU instructions per byte so it tends to be less efficient to process. However, when in an "XML interchange", CPU processing time isn't the only variable in play: the time to write those bytes to the network, disk, etc. can be significant as well. Thus, there's a delicate balance between the time it takes to produce and consume a document versus the time it takes to transfer a document from the producer to the consumer (and this is precisely why general compression like GZIP works in some cases but not in others).

By this time, you're probably asking yourself: Will EXI be faster than FI? The answer to this question is not that simple. First, when talking about processing efficiency, we can talk about why certain format features can enable (or disable) it, but it ultimately comes down to implementations. Second, as I tried to explain above, it may depend on the type of "interchange" in your application. For applications that rely on a low-bandwidth network (no, no, I won't try to quantify "low" in this case, so don't ask :), EXI is likely to offer improved performance. For other types of applications, well, we'll have to wait and see how good the EXI implementations will be. An implementation of Efficient XML, on which EXI is based, showed promising results in the measurements conducted by the group —although I must say this implementation was only available to the W3C not the WG members so, personally, I never had a chance to kick its tires.

On the subject of implementations, soon (hopefully, very soon) there will be an announcement regarding an open source implementation of EXI. As it often happens in projects of this kind, there are some legal hurdles that we need to clear first before the project can be announced. Stay tuned ...

Comments

• what is the status of openEXI?

  Posted by: johnmod on January 07, 2008 at 08:05 PM

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  Posted by: matemiasta on January 13, 2008 at 04:29 AM

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