[xwiki-users] Differences between extensions (observation Module)

Hello People, I am needing to create an observation module In my XWiki to monitor the comments creation actions of a specific space. All time that someone put a comment I need to send an email to a specific group. I have found these two instructions: http://extensions.xwiki.org/xwiki/bin/view/Extension/Observation+Module+Loc… http://platform.xwiki.org/xwiki/bin/view/DevGuide/JavaScriptAPI When I use one or other? What is the event that the XWiki generates when someone input a comment? DocumentUpdatedEvent? Thanks! Danilo Grupo Energisa Danilo Oliveira Analista Suporte Aplicacao TI - DPTO CORP. DE INFRAESTR. TI e-mail: danilo.oliveira(a)energisa.com.br | tel: (32) 3429-6342 | cel: (32) 8452-9478 Esta mensagem contém informação confidencial. Se você a recebeu por engano, não divulgue ou copie seu conteúdo. Por favor, avise ao remetente imediatamente e apague-a do computador. Privileged and confidential. If this message has been received by mistake, do not disclose or copy its contents. Please notify sender and delete immediately.