ecked/>
        <label class="tree-toggle-label "
               for="spike-architecture">SPIKE Architecture</label>

        <ul class="subtree">
            <li >
                    <a href="https://spike.ist/architecture/system-overview/">System Overview</a>
                </li>

                <li >
                    <a href="https://spike.ist/architecture/security-model/">SPIKE Security Model</a>
                </li>

                <li >
                    <a href="https://spike.ist/architectu