Important Details

amount of whitespace is not significant
- See example 02 rnc, xml
position-sensitive
- e.g., the words ‘text’, ‘element’, and ‘empty’ mean completely different things depending on position:
```
elment text { text }
```
```
elment element { empty }
```
```
element empty { empty }
```
text pattern can be used like an element
- See example 03 rnc, xml