Adding new attribute to existing xml file using sed or awk

I have a xml file which contains below details:

WSMQQueueConnectionFactory QMPMP 10.10.20.21

CHANNEL01 MQJMS_TP_CLIENT_MQ_TCPIP jboss:service=Naming

I want to search for a "HostName" attribute and add new attribute(port) after it. It should look like this :

WSMQQueueConnectionFactory QMPMP 10.10.20.21 1414 CHANNEL01 MQJMS_TP_CLIENT_MQ_TCPIP jboss:service=Naming Please suggest