Is BlogML better than the MoveableType import/export feature?
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That question was asked of me today so I thought that I'd blog the answer here as I'm sure that it will get asked many more times.
I haven't done a full investigation but, from my understanding, the default MT import/export functionality is very limited in that it will only persist a very small subset of content. In addition to the MT import/export feature there is a plug-in which extends it called "Type Mover" (or something). Again, from what I can gather, this plug-in uses a custom storage format for its process.
Ideally, MT would expose BlogML and, if "Type Mover" wanted to overlay its own value-add services - such as making the operation atomic or whatever - then it could easily do this by consuming the BlogML (a standard format). In fact, if "Type Mover" were to do this then they would find that their tool would automatically "just work" against any BlogML enabled blog - as opposed to being tied to MT.