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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.