private void processInclude(XmlFile xmlFile, XmlAttribute attribute) {
    final Set<XmlFile> set = myProcessingContext.get(VISITED_KEY);
    if (set.contains(xmlFile)) {
      return;
    }
    set.add(xmlFile);

    final XmlDocument document = xmlFile.getDocument();
    if (document == null) return;
    final XmlTag rootTag = document.getRootTag();
    if (rootTag == null) return;

    rootTag.processElements(this, attribute);
  }
private void processInclude(XmlFile xmlFile, XmlAttribute attribute)