String localName = attr.getLocalName();
String value = attr.getValue();
if ((value == null) || value.isEmpty())
return false;
else if (localName.equals("cellResolution"))
<BUG>return true;
else if (localName.equals("frameRate"))</BUG>
return true;
else if (localName.equals("frameRateMultiplier"))
return true;

String localName = attr.getLocalName();
String value = attr.getValue();
if ((value == null) || value.isEmpty())
return false;
else if (localName.equals("cellResolution"))
return true;
else if (localName.equals("displayAspectRatio"))    // TTML2
return true;
else if (localName.equals("frameRate"))
return true;
else if (localName.equals("frameRateMultiplier"))
return true;
