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JSF problem

 
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xmlns:gd="http://gravel.jboss.org/jsf/1.0/data"

I am working on JBOSS JBPM workflow project. As I am new wth JSF..I need to have some explanation about following tag

<gd:repeat value="#{tasks}" var="task" idVar="rid" first="#{tasks_pager.first}" limit="#{tasks_pager.limit}">

So here, value="#{tasks}" , where this collection or instance of persistence class is mapped in JSF. This file's extension is a xhtml. SO please anybody let me know about How we can access database from JSF file(xhtml).

How to retrieve data from database and show in JSF forms(i.e in xhtml files)
 
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