private void endDeclarable() {
    Declarable d = createDeclarable();
    stack.push(d);
  }
When we have finished a <code>declarable</code>, instantiate an instance of the
{@link Declarable}and push it on the stack.
geode-core/src/main/java/org/apache/geode/internal/cache/xmlcache/CacheXmlParser.java