public static List<DomElement> getDefinedChildren(
      @NotNull final DomElement parent, final boolean tags, final boolean attributes) {
    if (parent instanceof MergedObject) {
      final SmartList<DomElement> result = new SmartList<>();
      parent.acceptChildren(
          new DomElementVisitor() {
            @Override
            public void visitDomElement(final DomElement element) {
              if (hasXml(element)) {
                result.add(element);
              }
            }
          });
      return result;
    }

    ProgressManager.checkCanceled();

    if (parent instanceof GenericAttributeValue) return Collections.emptyList();

    if (parent instanceof DomFileElement) {
      final DomFileElement element = (DomFileElement) parent;
      return tags ? Arrays.asList(element.getRootElement()) : Collections.<DomElement>emptyList();
    }

    final XmlElement xmlElement = parent.getXmlElement();
    if (xmlElement instanceof XmlTag) {
      XmlTag tag = (XmlTag) xmlElement;
      final DomManager domManager = parent.getManager();
      final SmartList<DomElement> result = new SmartList<>();
      if (attributes) {
        for (final XmlAttribute attribute : tag.getAttributes()) {
          if (!attribute.isValid()) {
            LOG.error("Invalid attr: parent.valid=" + tag.isValid());
            continue;
          }
          GenericAttributeValue element = domManager.getDomElement(attribute);
          if (checkHasXml(attribute, element)) {
            ContainerUtil.addIfNotNull(result, element);
          }
        }
      }
      if (tags) {
        for (final XmlTag subTag : tag.getSubTags()) {
          if (!subTag.isValid()) {
            LOG.error("Invalid subtag: parent.valid=" + tag.isValid());
            continue;
          }
          DomElement element = domManager.getDomElement(subTag);
          if (checkHasXml(subTag, element)) {
            ContainerUtil.addIfNotNull(result, element);
          }
        }
      }
      return result;
    }
    return Collections.emptyList();
  }
 private static void replaceElements(XmlTag tag, TemplateBuilder builder) {
   for (XmlAttribute attribute : tag.getAttributes()) {
     XmlAttributeValue value = attribute.getValueElement();
     if (value != null) {
       builder.replaceElement(value, TextRange.from(1, 0), new MacroCallNode(new CompleteMacro()));
     }
   }
   if ("<".equals(tag.getText())) {
     builder.replaceElement(
         tag, TextRange.from(1, 0), new MacroCallNode(new CompleteSmartMacro()));
   } else if (tag.getSubTags().length == 0) {
     int i = tag.getText().indexOf("></");
     if (i > 0) {
       builder.replaceElement(
           tag, TextRange.from(i + 1, 0), new MacroCallNode(new CompleteMacro()));
     }
   }
   for (XmlTag subTag : tag.getSubTags()) {
     replaceElements(subTag, builder);
   }
 }
 public static void acceptAvailableChildren(
     final DomElement element, final DomElementVisitor visitor) {
   final XmlTag tag = element.getXmlTag();
   if (tag != null) {
     for (XmlTag xmlTag : tag.getSubTags()) {
       final DomElement childElement = element.getManager().getDomElement(xmlTag);
       if (childElement != null) {
         childElement.accept(visitor);
       }
     }
   }
 }
 @Nullable
 private static XmlTag getAnchor(
     @NotNull XmlTag contextTag, Editor editor, XmlElementDescriptor selected) {
   XmlContentDFA contentDFA = XmlContentDFA.getContentDFA(contextTag);
   int offset = editor.getCaretModel().getOffset();
   if (contentDFA == null) {
     return null;
   }
   XmlTag anchor = null;
   boolean previousPositionIsPossible = true;
   for (XmlTag subTag : contextTag.getSubTags()) {
     if (contentDFA.getPossibleElements().contains(selected)) {
       if (subTag.getTextOffset() > offset) {
         break;
       }
       anchor = subTag;
       previousPositionIsPossible = true;
     } else {
       previousPositionIsPossible = false;
     }
     contentDFA.transition(subTag);
   }
   return previousPositionIsPossible ? null : anchor;
 }