Order of prefixes' matching on relocation ?

["Serguei Ostrovskii" <sostrovsky snip net>]

Hello,
I grepped through all 20Mb of rpm-list.mbox and learned that
THE way to relocate a package is:
1) Have in .spec when building the package
Prefix: <absolute.path.from.1> <absolute.path.from.2> ...
2) Use in command line when installing the binary package
rpm -i ...  --relocate <absolute.path.from.1>=<absolute.path.to.1> --relocate <absolute.path.from.2>=<absolute.path.to.2> ...

I gather I'd  use something like
Prefix: %{_prefix} %{_defaultdocdir} %{_sysconfdir}

What's unclear is the order the prefixes get matched.
Example:

Often used values are

%_prefix	/usr
%_defaultdocdir	/usr/share/doc

It illustrates the scenario when one path is the exact subset of other.
Now, if %{_prefix} is matched first the things will be screwed up.
Question:
Do "from" patches from Prefix: match in the order they appear in the line,
or something more sensitive ( like try the longest patch first, etc. ) used ?

Thank you.

Sergey Ostrovsky.