private static boolean isMine(final PsiLanguageInjectionHost host) {
    if (host instanceof XmlAttributeValue) {
      final PsiElement p = host.getParent();
      if (p instanceof XmlAttribute) {
        final String s = ((XmlAttribute)p).getName();
        return !("xmlns".equals(s) || s.startsWith("xmlns:"));
      }
    }
    else if (host instanceof XmlText) {
      final XmlTag tag = ((XmlText)host).getParentTag();
      return tag != null/* && tag.getValue().getTextElements().length == 1 && tag.getSubTags().length == 0*/;
    }
    return false;
  }
private static boolean isMine(final PsiLanguageInjectionHost host)