For what I understood the software from IBICT uses OAI-PMH for harvesting.
(http://bdtd2.ibict.br/index.php?option=com_content&task=view&id=82&Itemid=135&limit=1&limitstart=2)

Greenstone can download files using OAI
(http://wiki.greenstone.org/wiki/index.php/OAI_support#The_Greenstone_OAI_server)

and can be an OAI server provider:
(http://wiki.greenstone.org/wiki/index.php/OAI_support#The_Greenstone_OAI_server).

regards,
nadia.

> Date: Wed, 25 Mar 2009 13:49:24 -0300
> From: xandbsb@gmail.com
> To: greenstone-users@list.scms.waikato.ac.nz
> Subject: [greenstone-users] Question about harvesting metadata
>
> Hi,
>
> My name is Alexandre, I am a system analyst at the IBICT - Instituto
> brasileiro de Informa??o em Ciencia e Tecnologia, we are testing the
> Greenstone, trying to harvest metadata by key-words. We would like to
> know if that task is possible and how that can be done through the
> software interface?
>
> We will appreciate your answer
>
> Sincerely
>
>
> Alexandre Faria
>
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> greenstone-users@list.scms.waikato.ac.nz
> https://list.scms.waikato.ac.nz/mailman/listinfo/greenstone-users

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