We need a canonical way to represent internally elements with multiple lines

```
bodyFromLine: line

	(self doesLineStartWithStopMarkup: line)
		ifTrue: [ isClosed := true ]
		ifFalse: [ body := body ifNil: [ line ] ifNotNil: [ 
				body , String cr , line ] ]
```

hard codes String cr and this would be ok if we can treat such information during tests