closed 4.2.1.1 2005-05-20T14:58:15.114-06:00 2004-06-12T21:33:26.796-06:00 TSD4.2 Archaeological Markup Language (ArchaeoML), version 0.9, February 2006. Created by David Schloen of the University of Chicago. Period document type. A Period document represents a temporal period.