cdm/src/main/java/thredds/inventory/filter/CompositeMFileFilter.java
private boolean exclude(MFile mfile) {
    if (excludeFilters == null) return false;
    for (MFileFilter filter : excludeFilters) {
      if (filter.accept(mfile))
        return true;
    }
    return false;
  }
private boolean exclude(MFile mfile) {
    if (excludeFilters == null) return false;
    for (MFileFilter filter : excludeFilters) {
      if (filter.accept(mfile))
        return true;
    }
    return false;
  }
exclusion is an AND