Parse successful
<?xml version="1.0" encoding="ISO-8859-1"?>
<Dataset xmlns="http://xml.opendap.org/ns/DAP/4.0#" xml:base="file:dap4/test_simple_1.xml" dapVersion="4.0" dmrVersion="1.0" name="test_simple_1">
    <Int32 name="x"/>
</Dataset>

<?xml version="1.0" encoding="ISO-8859-1"?>
<Dataset xmlns="http://xml.opendap.org/ns/DAP/4.0#" xml:base="file:dap4/test_simple_1.xml" dapVersion="4.0" dmrVersion="1.0" name="test_simple_1">
    <Int32 name="x"/>
</Dataset>

The data:
{ 123456789 }