Quick Tangent : XML Schema Evolution

So, after my last post, I got curious: is there any software out there that performs XML schema evolution, even if it’s proprietary? Oddly, after searching for a few minutes, the answer “no” seemed to be coming back from the web. Now, Oracle and IBM do offer a service to update your current XML documents according to a new schema…but only if it doesn’t invalidate the old schema. Basically, their “evolution” functionality allows you to further refine your schema’s rules, like changing the maximum/minimum of a tag’s occurrence or adding a new required tag. That’s hardly any sort of evolution; it doesn’t even provide the ability to automatically rename tags/properties like Avro! So, the claims of Oracle and IBM might be more marketing than engineering.

But I guess that marketing and buzzwords are all too normal in software…After all, whoever coined the term string interpolation definitely took some severe liberties, since it’s sure a long way off from real interpolation. In any case, there seems to be an opening for a niche market here, one which could be somewhat lucrative. However, these days, all the big bets of towering chips are on the table of machine learning, big data, and AI. In the eyes of the major league, anything that deals with XML (i.e., old-school data processing) should go play the slot machines.

Good for me…I don’t mind being stuck alone in a dark corner! Reminds me of playing Street Fighter 2 by myself in the back of a pizza parlor and having a blast…In any case, I was looking for tools that could help build an engine for XML schema evolution. Interestingly, I found an open source project by Dmitry Pekar that can convert both ways between XML and Avro. That could help by extending the functionality already in Avro…but besides the simple renaming of tags/properties, it doesn’t satisfy my proposed requirements. (Plus, your distributed architecture would have to ultimately use Avro, which would be a refactoring headache in some instances.) I haven’t found anything else yet, which makes me suspect that my handcrafted MDD approach might be the only viable option.

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