@Nullable
  @Override
  public TextAttributesKey getKeyForNamespace(String namespace, XmlElement context) {
    if (!(context instanceof XmlTag)) return null;
    if (XsltSupport.XSLT_NS.equals(((XmlTag)context).getNamespace())) return XsltSupport.XSLT_DIRECTIVE;
    return null;
  }
@Nullable
  @Override
  public TextAttributesKey getKeyForNamespace(String namespace, XmlElement context)