I went with XML::Twig and got a little further (thanks!) unfortunately it's still upset that the XML isn't quite "well-formed" XML example:

--boundary
Content-Type: application/xml; charset="UTF-8"
Content-Length: 478

<EventNotificationAlert version="1.0" xmlns="http://www.hikvision.com/
+ver10/XMLSchema">
<ipAddress>10.1.10.23</ipAddress>
<portNo>80</portNo>
<protocol>HTTP</protocol>
<macAddress>c4:2f:90:00:00:00</macAddress>
<channelID>1</channelID>
<dateTime>2015-06-24T19:37:22--8:00</dateTime>
<activePostCount>0</activePostCount>
<eventType>videoloss</eventType>
<eventState>inactive</eventState>
<eventDescription>videoloss alarm</eventDescription>
</EventNotificationAlert>
--boundary
Content-Type: application/xml; charset="UTF-8"
Content-Length: 514

<EventNotificationAlert version="1.0" xmlns="http://www.hikvision.com/
+ver10/XMLSchema">
<ipAddress>10.1.10.23</ipAddress>
<portNo>80</portNo>
<protocol>HTTP</protocol>
<macAddress>c4:2f:90:00:00:00</macAddress>
<channelID>1</channelID>
<dateTime>2015-06-24T19:37:22--8:00</dateTime>
<activePostCount>1</activePostCount>
<eventType>VMD</eventType>
<eventState>active</eventState>
<eventDescription>Motion alarm</eventDescription>
<DetectionRegionList>
</DetectionRegionList>
</EventNotificationAlert>
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