Space is a Separator with the orient default to " horizontal ".

In other words, <space> is equivalent to <separator orient="horizontal">

line 1 by separator
<separator />
line 2 by separator
<separator />
line 3 by separator
<space bar="true" />
another piece
<separator spacing="20px" />
line 4 by separator
<space bar="true" spacing="20px" />
another piece