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_8.1.xml" dapVersion="4.0" dmrVersion="1.0" name="test_simple_8.1">
    <Sequence name="outer">
        <Float32 name="x"/>
        <Float32 name="y"/>
        <Sequence name="inner">
            <Int32 name="i1"/>
            <String name="s"/>
        </Sequence>
    </Sequence>
</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_8.1.xml" dapVersion="4.0" dmrVersion="1.0" name="test_simple_8.1">
    <Sequence name="outer">
        <Float32 name="x"/>
        <Float32 name="y"/>
        <Attribute name="DAP4_Checksum_CRC32" type="String">
            
        </Attribute>
    </Sequence>
</Dataset>

The data:
{ { { -54.4, -54.4 }, { -1.77, -1.77 }, { 98.93, 98.93 }, { 92.68, 92.68 } } }