//NamespaceHandlerSupport implements NamespaceHandler

                            2.1 findParserForElement(element, parserContext).parse(element, parserContext)//找到不同的解析器去處理解析到的內容// NamespaceHandlerSupportBeanDefinitionParser parser = this.parsers.get(localName);

//BeanDefinitionParser 這個是解析器的介面

//判斷是否有註解

if (metadata == null || !metadata.isAnnotated(Conditional.class.getName())) {

   return false;

  }        

AnnotationMetadataReadingVisitor extends ClassMetadataReadingVisitor implements AnnotationMetadata 

//AnnotationMetadataReadingVisitor 類存放解析之後的類容

//將檔案放到快取的CachingMetadataReaderFactory裡面，同時將類的註解資訊放到

 AnnotationMetadataReadingVisitor visitor = new AnnotationMetadataReadingVisitor(classLoader);

 private MetadataReaderFactory metadataReaderFactory =  new CachingMetadataReaderFactory(this.resourcePatternResolver);

new SimpleMetadataReader(resource, this.resourceLoader.getClassLoader())

public MetadataReader getMetadataReader(Resource resource) throws IOException {

  if (getCacheLimit() <= 0) {

   return super.getMetadataReader(resource);

  }

  synchronized (this.metadataReaderCache) {

   MetadataReader metadataReader = this.metadataReaderCache.get(resource);

   if (metadataReader == null) {

    metadataReader = super.getMetadataReader(resource);

    this.metadataReaderCache.put(resource, metadataReader);

   }

   return metadataReader;

  }

 }

 CachingMetadataReaderFactory extends SimpleMetadataReaderFactory

readClass(final InputStream is, boolean close)    //ClassReader //讀取類的資訊 

//AnnotationMetadataReadingVisitor extends ClassMetadataReadingVisitor implements AnnotationMetadata

 public AnnotationVisitor visitAnnotation(final String desc, boolean visible) {

  String className = Type.getType(desc).getClassName();

  this.annotationSet.add(className);

  return new AnnotationAttributesReadingVisitor(className, this.attributesMap, this.metaAnnotationMap, this.classLoader);

 } 

根據原始檔的  SourceFile LoginController.java +Lorg/springframework/stereotype/Controller; !         去判斷註解了那些類

//PluggableSchemaResolver 獲取所有schem 放到properties裡面

getSchemaMappings（）{

Properties mappings =

        PropertiesLoaderUtils.loadAllProperties(this.schemaMappingsLocation, this.classLoader);

}