Query result cache used for getRelatedNodes from MMObjectNodes. Entries are invalidated on the
normal QueryResultCache way, but also if the one node from which the related nodes were requested is
removed from the Node Cache itself.
author: Michiel Meeuwissen version: $Id: RelatedNodesCache.java,v 1.11 2007/02/11 19:21:11 nklasens Exp $ See Also:org.mmbase.module.core.MMObjectNode.getRelatedNodes since: MMBase-1.7