How to get correct formatting using EzXML?

Hi!

I am using EzXML trying to make my own custom XML file through julia. I want something that looks like:

<?xml version="1.0" encoding="UTF-8" ?>
<case>
    <casedef>
        <constantsdef>            
            <gravity x="0" y="0" z="-9.81" comment="Gravitational acceleration" units_comment="m/s^2" />
            <rhop0 value="1000" comment="Reference density of the fluid" units_comment="kg/m^3" />
        </constantsdef>
    </casedef>
</case>

Then using EzXML and this following code (very coarse code just to get it to work):

using EzXML

doc = parsexml("""
<?xml version="1.0" encoding="UTF-8" ?>
<case>
</case>
""")

rd  = root(doc)

constantsdef = addelement!(rd,"constantsdef")

gravity      = addelement!(constantsdef,"gravity")

gx = AttributeNode("x","0")
gy = AttributeNode("y","0")
gz = AttributeNode("z","-9.81")

link!(gravity,gx)
link!(gravity,gy)
link!(gravity,gz)

comment=AttributeNode("comment","Gravitational acceleration") 
units_comment=AttributeNode("units_comment","m/s^2")

link!(gravity,comment)
link!(gravity,units_comment)

rhop0      = addelement!(constantsdef,"rhop0")

rhop0_value = AttributeNode("value","1000")


link!(rhop0,rhop0_value)

comment=AttributeNode("comment","Reference density of the fluid") 
units_comment=AttributeNode("units_comment","kg/m^3")

link!(rhop0,comment)
link!(rhop0,units_comment)

write("Test.xml",doc)

The end result is:

Which is the correct elements, but no type of indentation / new lines are being applied to make it humanreadable too. Could anyone help out?

Thanks, kind regards