@FunctionalInterface public interface NamespaceHandlerResolver
DefaultBeanDefinitionDocumentReader to
 locate a NamespaceHandler implementation for a particular namespace URI.NamespaceHandler, 
DefaultBeanDefinitionDocumentReader| Modifier and Type | Method and Description | 
|---|---|
| NamespaceHandler | resolve(String namespaceUri)Resolve the namespace URI and return the located  NamespaceHandlerimplementation. | 
@Nullable NamespaceHandler resolve(String namespaceUri)
NamespaceHandler
 implementation.namespaceUri - the relevant namespace URINamespaceHandler (may be null)