<a href="#thread_safety">Thread safety</a></li>
<li class="level2"><a href="#compatibility">Version compatibility</a></li>
<li class="level2"><a href="#event_order">Event order</a></li>
</ul>
</li>
<li class="level1"><a href="#intro_version">Version management</a><ul><li class="level2"><a href="#intro_version_compile">Compile-time version</a></li>
<li class="level2"><a href="#intro_version_runtime">Run-time version</a></li>
<li class="level2"><a href="#intro_version_string">Version string</a></li>
</ul>
</l