Recursive XSL Selection

The XML looks like this:

<?xml version="1.0" encoding="UTF-8" ?>
<nodes xmlns:xsi="http://ift.tt/ra1lAU">
    <element>Content1</element>
    <element>Content2</element>
    <element>Content3</element>
    <parent>
        <element>Content4</element>
        <element>Content5</element>
            <parent>
                <element>Content6</element>
                    <parent>
                        <element>Content7</element>
                        <element>Content8</element>
                    </parent>
                <element>Content9</element>
            </parent>
        <element>Content10</element>
        <element>Content11</element>
    </parent>
    <element>Content12</element>
    <parent>
        <element>Content13</element>
        <element>Content14</element>
    </parent>
    <element>Content15</element>
</nodes>

I want to select all nodes called elements, also if they are inside of parent and i want to know how many parent elements they have so I can display this html structure in html like this:

<pre>
Content1
Content2
Content3
    Content4
    Content5
        Content6
            Content7
            Content8
        Content9
    Content10
    Content11
Content12
    Content13
    Content14
Content15
</pre>

Any thoughts?