added an emptiable method.   Will be filled in when we do particle derivation stuff next month
added an emptiable method.   Will be filled in when we do particle derivation stuff next month


git-svn-id: 21df804813e9d3638e43477f308dd0be51e5f30f@317671 13f79535-47bb-0310-9956-ffa450edef68

ronsigal/xerces,jimma/xerces,RackerWilliams/xercesj,jimma/xerces,ronsigal/xerces,RackerWilliams/xercesj,RackerWilliams/xercesj,jimma/xerces,ronsigal/xerces