@Override
  public PsiReference @NotNull [] getReferencesByElement(@NotNull PsiElement element, final @NotNull ProcessingContext context) {
    LOG.assertTrue(element instanceof XmlAttributeValue);
    XmlAttributeValue value = (XmlAttributeValue)element;
    PsiElement parent = value.getParent();
    if (parent instanceof XmlAttribute attribute) {
      XmlTag tag = attribute.getParent();
      @NonNls String name = attribute.getLocalName();
      if (tag != null && "meta".equals(tag.getLocalName()) && tag.getAttribute("http-equiv") != null && name.equals("content")) {
        return extractFromContentAttribute(value);
      }
    }

    return PsiReference.EMPTY_ARRAY;
  }
@Override
  public PsiReference @NotNull [] getReferencesByElement(@NotNull PsiElement element, final @NotNull ProcessingContext context)