What significance does "NewWeb" and "Blank" configurations have in WSS site definitions

Question

I customize a WSS site definitions by tweaking one of the built in definitions. When examining the sts definition, I see it has a configuration "NewWeb" with ID -1, and "Blank" with ID 1. In the sps definition these are defined like this:

<Configuration ID="-1" Name="NewWeb"/>
<Configuration ID="1" Name="Blank">
  <ExecuteUrl Url="_layouts/[%=Web.Language%]/settings.aspx" />
</Configuration>

Does anyone know what significance these have? Should I include them in my custom definition, or may I safely omit them?

Answer 1

NewWeb is web that has no template associated with it. Essentially, simply a provisioned URL.

BlankWeb is a template that specifies no lists or libraries