roller疑惑

今天在看 Roller 的源码的时候，看到在hibernate.cfg.xml文件中：

xml 代码

<!-- Map Roller pojo classes -->
        <mapping resource="org/apache/roller/pojos/BookmarkData.hbm.xml" />
        <mapping resource="org/apache/roller/pojos/CommentData.hbm.xml" />
        <mapping resource="org/apache/roller/pojos/EntryAttributeData.hbm.xml" />
        <mapping resource="org/apache/roller/pojos/FolderAssoc.hbm.xml" />
        <mapping resource="org/apache/roller/pojos/FolderData.hbm.xml" />
        <mapping resource="org/apache/roller/pojos/WeblogTemplate.hbm.xml" />
        <mapping resource="org/apache/roller/pojos/PingCategoryRestrictionData.hbm.xml" />
        <mapping resource="org/apache/roller/pojos/AutoPingData.hbm.xml" />
        <mapping resource="org/apache/roller/pojos/PingQueueEntryData.hbm.xml" />
        <mapping resource="org/apache/roller/pojos/PingTargetData.hbm.xml" />
        <mapping resource="org/apache/roller/pojos/RefererData.hbm.xml" />
        <mapping resource="org/apache/roller/pojos/RoleData.hbm.xml" />
        <mapping resource="org/apache/roller/pojos/RollerConfigData.hbm.xml" />
        <mapping resource="org/apache/roller/pojos/UserData.hbm.xml" />
        <mapping resource="org/apache/roller/pojos/WeblogCategoryData.hbm.xml" />
        <mapping resource="org/apache/roller/pojos/WeblogCategoryAssoc.hbm.xml" />
        <mapping resource="org/apache/roller/pojos/WeblogEntryData.hbm.xml" />
        <mapping resource="org/apache/roller/pojos/WebsiteData.hbm.xml" />
        <mapping resource="org/apache/roller/pojos/RollerPropertyData.hbm.xml" />
        <mapping resource="org/apache/roller/pojos/PermissionsData.hbm.xml" />
        <mapping resource="org/apache/roller/pojos/PlanetConfigData.hbm.xml" />
        <mapping resource="org/apache/roller/pojos/PlanetGroupData.hbm.xml" />
        <mapping resource="org/apache/roller/pojos/PlanetEntryData.hbm.xml" />
        <mapping resource="org/apache/roller/pojos/PlanetSubscriptionData.hbm.xml" />

但是，我在org/apache/roller/pojos包下面根本没有看到这些文件啊，难道这其中有什么玄机？