/usr/share/mixxx/controllers/HID Keyboard.hid.xml.example is in mixxx-data 2.0.0~dfsg-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18  | <?xml version="1.0" encoding="utf-8"?>
<MixxxControllerPreset schemaVersion="1" mixxxVersion="1.11+">
    <info>
        <name>Apple Bluetooth Keyboard</name>
        <author>Ilkka Tuohela</author>
        <description>HID example for Apple Bluetooth Keyboard</description>
        <devices>
            <product protocol="hid" vendor_id="0x5ac" product_id="0x23a" usage_page="0x1" usage="0x6" interface_number="0x1" />
        </devices>
    </info>
    <controller id="Apple Bluetooth Keyboard">
        <scriptfiles>
            <file filename="common-hid-packet-parser.js" functionprefix=""/>
            <file filename="common-hid-devices.js" functionprefix=""/>
            <file filename="Apple Bluetooth Keyboard.js" functionprefix="AppleBluetoothKeyboard"/>
        </scriptfiles>
    </controller>
</MixxxControllerPreset>
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