jboss 5 GA, "Context not found as a child of Host" in server.xml

In server.xml, the following worked from at least 4.0.5 until 5.0.0.Beta4

<Host name="localhost">
<Valve className="org.jboss.web.tomcat.service.jca.CachedConnectionValve"
cachedConnectionManagerObjectName="jboss.jca:service=CachedConnectionManager"
transactionManagerObjectName="jboss:service=TransactionManager" />

<Context path="/dev" docBase="/programs/myDev" reloadable="true"/>

</Host>

This error now gets thrown in 5.0.0GA:

11:48:18,994 ERROR [AbstractKernelController] Error installing to Start: name=WebServer state=Create

org.jboss.xb.binding.JBossXBException: Failed to parse source: Context not found as a child of Host
at org.jboss.xb.binding.parser.sax.SaxJBossXBParser.parse(SaxJBossXBParser.java:203)
at org.jboss.xb.binding.parser.sax.SaxJBossXBParser.parse(SaxJBossXBParser.java:183)
at org.jboss.xb.binding.UnmarshallerImpl.unmarshal(UnmarshallerImpl.java:133)
at org.jboss.web.tomcat.service.deployers.TomcatService.startService(TomcatService.java:171)

at org.jboss.system.ServiceMBeanSupport.jbossInternalStart(ServiceMBeanSupport.java:376)
...

There are no release notes or other docs I can find explaining this change. The latest tomcat docs say:

http://tomcat.apache.org/tomcat-6.0-doc/config/context.html

"Context elements may be explicitly defined:
...
inside a Host element in the main conf/server.xml