<ul><li class="depth-1 "><a href="Desiderata.html"><div class="inner"><span>Desiderata</span></div></a></li><li class="depth-1 "><a href="Using_ActivityPub.html"><div class="inner"><span>Using ActivityPub</span></div></a></li><li class="depth-1  current"><a href="Validation_Faults.html"><div class="inner"><span>Validation Faults in ActivityPub documents</span></div></a></li><li class="depth-1 "><a href="intro.html"><div class="inner"><span>The Old Dog and Duck</span></div></a></li></ul><h3 class="no-link"><