<p>Firstly the web site doesn't use a postigs database - it uses a postgres database without the postgis extension.</p>
<p>Secondly in a literal sense it could be stored in the same database but as the schema is completely different the data would all be duplicated - the rendering data is held as postgis geometries while the main database is a database of our of design that preserves topology (how roads etc interconnect) which is not possible when using geometries.</p>

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