Create a nested XML file

I would like to create an XML file where elements can be nested inside each other. I haven't found much documentation of this and I have got this working without nesting but when I try to next elements inside of each other I don't get my expected output. Take the following example (taken from Mathworks website):

docNode = com.mathworks.xml.XMLUtils.createDocument('root_element');

docRootNode = docNode.getDocumentElement;
docRootNode.setAttribute('attr_name','attr_value');
for i=1:5
    thisElement = docNode.createElement('child_node'); 
    thisElement.appendChild(docNode.createTextNode(sprintf('%i',i)));
    docRootNode.appendChild(thisElement);
end
docNode.appendChild(docNode.createComment('this is a comment'));

xmlFileName = ['tempname.xml'];
xmlwrite(xmlFileName,docNode);
type(xmlFileName);

This give the output (as I would expect):

<?xml version="1.0" encoding="utf-8"?>
<root_element attr_name="attr_value">
   1
   2
   3
   4
   5
</root_element><!--this is a comment-->

But when I try to add another node into the picture:

docNode = com.mathworks.xml.XMLUtils.createDocument('root_element');

docRootNode = docNode.getDocumentElement;
docRootNode.setAttribute('attr_name','attr_value');
for i=1:5
    thisElement = docNode.createElement('child_node');
    thisElement.appendChild(docNode.createTextNode(sprintf('%i',i)));
    docRootNode.appendChild(thisElement);

      nestedElement = docNode.createElement('nested_node');
      nestedElement.appendChild(docNode.createTextNode(sprintf('%i',i + 10)));
      thisElement.appendChild(nestedElement);
  end
  docNode.appendChild(docNode.createComment('this is a comment'));

xmlFileName = ['tempname.xml'];
xmlwrite(xmlFileName,docNode);
type(xmlFileName);

I get this output:

<?xml version="1.0" encoding="utf-8"?>
<root_element attr_name="attr_value">
   1<nested_node>11</nested_node>
   
   2<nested_node>12</nested_node>
   
   3<nested_node>13</nested_node>
   
   4<nested_node>14</nested_node>
   
   5<nested_node>15</nested_node>
   
</root_element><!--this is a comment-->

But this is the input I was expecting:

<?xml version="1.0" encoding="utf-8"?>
<root_element attr_name="attr_value">
   1
        <nested_node>11</nested_node>
   
   2
        <nested_node>12</nested_node>
   
   3
        <nested_node>13</nested_node>
   
   4
        <nested_node>14</nested_node>
   
   5
        <nested_node>15</nested_node>
   
</root_element><!--this is a comment-->

Is there any way that you can add in the newlines from the code?

[Duke]

I found out something interesting, if I comment out one line I get the results that I would expect:

docNode = com.mathworks.xml.XMLUtils.createDocument('root_element');
docRootNode = docNode.getDocumentElement;
docRootNode.setAttribute('attr_name','attr_value');

for i=1:5
    thisElement = docNode.createElement('child_node');
    %thisElement.appendChild(docNode.createTextNode(sprintf('%i',i)));
    docRootNode.appendChild(thisElement);

      nestedElement = docNode.createElement('nested_node');
      nestedElement.appendChild(docNode.createTextNode(sprintf('%i',i + 10)));
      thisElement.appendChild(nestedElement);
  end

docNode.appendChild(docNode.createComment('this is a comment'));
xmlFileName = ['tempname.xml'];
xmlwrite(xmlFileName,docNode);
type(xmlFileName);

Which produces:

<?xml version="1.0" encoding="utf-8"?>
<root_element attr_name="attr_value">
   
      <nested_node>11</nested_node>
   
   
      <nested_node>12</nested_node>
   
   
      <nested_node>13</nested_node>
   
   
      <nested_node>14</nested_node>
   
   
      <nested_node>15</nested_node>
   
</root_element><!--this is a comment-->

So if I remove the wording I get the layout that I would expect. Is it possible to “have my cake and eat it too” by getting this layout with the wording or is that improper XML format and that’s why I’m getting the un-nested result when I have the wording in the child_node?