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A lot of web developers you meet hate XML with a passion, and JSON has taken its place as the format of choice for a lot of API work. There are some advantages to JSON, but some disadvantages, and XML does have some problems, but the arguments are not as simple as generally made out.

I have been looking at the issue of writing filters for formats that basically change them as little as possible. This is a slightly difficult field in many ways. You have to store a fair amount of extra information in order to do this, but if you are say changing some metadata items for a user they may not want their CDATA removed and replaced with a semantically identical but syntactically different form. So I am looking at the formats partly from this point of view. Sometimes this brings up the conflicts between the human readable and computer manipulation aspects of these formats, the logical and physical structures. I have also been looking at making simple tools to allow modification of document formats, which has also raised some issues.



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