12.8. High-traffic changes
Through this tutorial you have created catalog pages that use the [include] tag to include template pieces in the pages. This has worked well, but there are a few drawbacks. First, if you want to rename any of the template piece files or move them out of the main catalog directory and into their own subdirectory, you would have to update the [include] tag on every page. To avoid this, you can create catalog variables set to the [include] tags. Add these lines to your catalog.cfg file:
Variable TOP [include top] Variable LEFT [include left] Variable BOTTOM [include bottom]
Now change every instance of [include top] to __TOP__, doing the same for each [include] tag. At this point, you might not want to do a search-and-replace on all the .html files you just created, but keep this capability in mind for the next catalog you work on.
If you made all of the replacements and then renamed and moved your top file, you would only have to make a single change for each region in catalog.cfg to get your pages up to date:
Variable TOP [include templates/main-top]
And so on, depending on your naming scheme.