There used to be explain docs for SRU/ZeeRex at
http://explain.z3950.org/ . I had that URL bookmarked, and linked to
from my own docs for other tools, etc.
That URL currently redirects to simply http://zeerex.z3950.org/, a home
page with some links, that are not making it easy for me to find the
actual docs for the Explain response.
Can anyone help me out here? Where might I find the docs for Explain?