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These three suffixes are understood by the loader. Here the dataset has the name <tt>standard</tt> and the three database files are merged, where later entries having the same tag overload previous ones. Definitions in the document source (coded in TEX speak) are also added, and they are saved for successive runs. This means that if you load and define entries, they will be known at a next run beforehand, so that references to them are independent of when loading and definitions take place.
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<span style="font-style:oblique;" > setup definition setupbtxdataset </span >
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