[Zope] From whence came <base>?

[Charlie Reiman]

I have a simple site with two pages

/corp/index_html
/corp/sub/index_html

Both are DTML documents.
Both have identical html headers (as far as my eyes can tell).
The sub/index_html takex GET arguments, the other does not:

/corp/sub/index_html?blah=yep&foo=nope

The rendered source for /corp/index_html as seen from the browser has a
<BASE> tag I never requested (but really want!)

The rendered source for /corp/sub/index_html does not have a <base> tag.

This second fact is upsetting. I'd really like to get a <base> tag in there.
Aside from manually inserting it, how can I get zope to do whatever magic it
did on the first page?

Charlie Reiman