code: public static boolean isRevisionDumpFile(DumpContentType dumpContentType) {
  		if (WmfDumpFile.REVISION_DUMP.containsKey(dumpContentType)) {
  			return WmfDumpFile.REVISION_DUMP.get(dumpContentType);
  		} else {
  			throw new IllegalArgumentException("Unsupported dump type "
  					+ dumpContentType);
  		}
  	}
docs: Returns true if the given dump file type contains page revisions and
  false if it does not. Dumps that do not contain pages are for auxiliary
  information such as linked sites.
  
  @param dumpContentType
  the type of dump
  @return true if the dumpfile contains revisions
  @throws IllegalArgumentException
  if the given dump file type is not known