http://activemq.apache.org/ref/schema/activemq-core-5.0.0.xsd.html
linked to from http://activemq.apache.org/xml-reference.html gives Forbidden You don't have permission to access /ref/schema/activemq-core-5.0.0.xsd.html on this server. Apache/2.2.8 (Unix) Server at activemq.apache.org Port 80