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<< The only impact I can see is that it means more ways need to be provided to parse such XML and if the format does not fit into the general parsing framework (ie, some XML declaration encoding indicating the binary encoding of the XML), it will be architecturally more challenging. There's an impact on indexing and query optimization. Consider a tax return table with a column for year and a column of type XML that contains the tax return. If the DBMS manages the XML return column as multi-dimensional binary data, it will need sophisticated indexing and access methods (bitmap / bitcube, UB-tree, r-tree, K-D-B tree) to deliver performance. That puts the query optimizer in the loop.
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