private Declarable createDeclarable() {
    return createDeclarable(cache, stack);
  }
Creates and initializes an instance of {@link Declarable} from the contents of the stack.

@throws CacheXmlException Something goes wrong while instantiating or initializing the
        declarable
geode-core/src/main/java/org/apache/geode/internal/cache/xmlcache/CacheXmlParser.java