data1: [%data1%]<br>
data2: <br>
[%data2:%] &nbsp; [%$_%]<br> [%:data2%]
data3: <br>
[%data3:%]
 &nbsp; data1: [%$_.data1%]<br>
 &nbsp; data2: <br>
 [%$_.data2:%] &nbsp;&nbsp; [%$_%]<br> [%:$_.data2%]
 &nbsp; data3: <br>
 [%$_.data3:%]
  &nbsp;&nbsp; data_x: [%$_.data_x%] data_y: [%$_.data_y%]<br>
 [%:$_data3%]
[%:data3%]
[%data4:%]
There's nothing in this data and the entire block will simply be left out of the output.
[%:data4%]

Here's a direct reference to a nested key<br>
data2 array count is: [%data3.data3.data_y%]<br>
<br>
Since data_x and data_y are unique here's another way to get to them:<br>
[%data3.data3:%]
 data_x: [%data_x%]<br>
 data_y: [%data_y%]<br>
[%:data3.data3%]

<br>
And yet another:<br>
[%data3:%]
 data_x: [%$_.data3.data_x%]<br>
 data_y: [%$_.data3.data_y%]<br>
[%:data3%]