Nhibernet and spring how they are woked together in a project

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i am fresher and i have a in project to explore i am getting difficulty to explore hbm.xml(for mapping i knew) in DAO because my project is using nhibernet and spring. does any body provide some IDEA about following code .

<?xml version="1.0" encoding="utf-8" ?>
<objects xmlns="http://www.springframework.net">

 <object id="CentreDao" type="AMD.dao.impl.CentreDaoImpl, AMD" singleton="false">
   <property name="SessionFactory" ref="NHibernateSessionFactory"/>
  </object>

</objects>

and how the nhibernet and spring work together .i will be vary thankful to u