i wanna write a application with java to access the digital Library which based on greenstone 3.

so i found a problem by building the request in URL with cgi.
There are some examples online:

http://nzdl.sadl.uleth.ca/cgi-bin/library?a=q&r=1&hs=1&e=p-00000-00---off-0dspaceZz-e--00-0--0-10-0---0---0prompt-10---4-------0-1l--11-en-50---20-about---00-0-1-00-0-0-11-1-0utfZz-8-00&h=dte&t=1&q=level
or:
http://www.cincinnatimemory.org/cgi-bin/library?a=q&r=1&hs=1&e=q-000-00---0greaterc--00-0-0--0prompt-10---4----ddd--0-1l--1-en-50---20-about-level--00031-001-1-0utfZz-8-00&h=ddd&t=1&q=level

what is the "e" cgi in the URL? I didn't find any information about the "e" cgi in the manual.pdf of Greenstone 3. Or it is just a used CGI Argument for the version 2.7.

If it is also for the greenstone 3, how can i build a URL with "e" CGI Argument?

Please help me!
Regard
feng wang
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