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Hi Leandro,

I made an example of a data-generated catalog a while back, and just updated it for InDesign CS, this might give you a general idea of what's involved in scripting such a catalog:
 <http://siliconpublishing.com/InDesign/CatalogExample.htm>

With 20,000 items you may hit the need to work with "chunks" of the catalog: InDesign scripting gets slower as the page count climbs, so we tend to script creation of larger documents by generating 10 or so pages at a time and scripting the aggregation of the generated files into a book. This has worked great, speed is tolerable even for 600 page catalogs with heavy graphics.

There are different approaches you can take depending on layout. The above example is simple in that there is a fixed number of products per page: the more complex case is when text or image size is variable or when a single product can span across multiple pages. Probably best to determine what layout you want first, then script the generation of the catalog.

Hope this helps,

Max

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Max Dunn
Silicon Publishing
www.siliconpublishing.com