Steps to reproduce:
- convert a type 4 DAISY 2.02 book to EPUB 3 using the daisy202-to-epub3 script
- check that EPUB is valid with epub3-validator
- convert EPUB 3 to DAISY 2.02 using epub3-to-daisy202 script

The ncc is based on the EPUB 3 navigation document. However, it is not properly converted. Most of the metadata is missing, and the content is mostly the same as in the EPUB 3 navigation document.

input ncc:
```html

Title

Title

Lydbokavtalen

Bokinformasjon

Informasjon om DAISY-boka

2
3
4
5
6

Baksidetekst

7

Innhold

8
9

Den store sydenturen

...

```

output ncc:
```html

(Title)

```