sectionPart = newSectionPart(textSection, child);
// if (sectionPart == null)
// throw new IllegalArgumentException("Unsupported node " + child);
// TODO list node types in exception
sectionPart = newSectionPart(textSection, child);
// if (sectionPart == null)
// throw new IllegalArgumentException("Unsupported node " + child);
// TODO list node types in exception