private void startRegion(Attributes atts) {
    String name = atts.getValue(NAME);
    String refid = atts.getValue(REFID);
    Assert.assertTrue(name != null);
    RegionCreation region = new RegionCreation(cache, name, refid);
    stack.push(region);
  }
When a <code>region</code> element is first encountered, we create a {@link RegionCreation}and
push it on the stack.
geode-core/src/main/java/org/apache/geode/internal/cache/xmlcache/CacheXmlParser.java