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_array_5.xml" dapVersion="4.0" dmrVersion="1.0" name="test_array_5">
    <Dimension name="row" size="3"/>
    <Dimension name="col" size="4"/>
    <Int8 name="a">
        <Dim name="/row"/>
        <Dim name="/col"/>
    </Int8>
    <UInt8 name="b">
        <Dim name="/row"/>
        <Dim name="/col"/>
    </UInt8>
    <Int64 name="c">
        <Dim name="/row"/>
        <Dim name="/col"/>
    </Int64>
    <UInt64 name="d">
        <Dim name="/row"/>
        <Dim name="/col"/>
    </UInt64>
</Dataset>

<?xml version="1.0" encoding="ISO-8859-1"?>
<Dataset xmlns="http://xml.opendap.org/ns/DAP/4.0#" xml:base="file:dap4/test_array_5.xml" dapVersion="4.0" dmrVersion="1.0" name="test_array_5">
    <Dimension name="row" size="3"/>
    <Dimension name="col" size="4"/>
    <Int8 name="a">
        <Dim name="/row"/>
        <Dim name="/col"/>
    </Int8>
    <UInt8 name="b">
        <Dim name="/row"/>
        <Dim name="/col"/>
    </UInt8>
    <Int64 name="c">
        <Dim name="/row"/>
        <Dim name="/col"/>
    </Int64>
    <UInt64 name="d">
        <Dim name="/row"/>
        <Dim name="/col"/>
    </UInt64>
</Dataset>

The data:
{ {{127, 127, 127, 127},{127, 127, 127, 127},{127, 127, 127, 127}}, {{255, 255, 255, 255},{255, 255, 255, 255},{255, 255, 255, 255}}, {{72057594037927935, 72057594037927935, 72057594037927935, 72057594037927935},{72057594037927935, 72057594037927935, 72057594037927935, 72057594037927935},{72057594037927935, 72057594037927935, 72057594037927935, 72057594037927935}}, {{18446744073709551615, 18446744073709551615, 18446744073709551615, 18446744073709551615},{18446744073709551615, 18446744073709551615, 18446744073709551615, 18446744073709551615},{18446744073709551615, 18446744073709551615, 18446744073709551615, 18446744073709551615}} }