how do you insert an element into an xml document with namespace

[dotnetnoob]

perfix?

<bac:BACnetDevice APDUTimeout='' ApplicationSoftwareVersion=''
FirmwareRevision='' InstanceNumber='3744' MaxAPDULengthAccepted=''
ModelName='' NumberOfAPDURetries='' ProtocolConformanceClass=''
ProtocolObjectTypesSupported='' ProtocolServicesSupported=''
ProtocolVersion='' SegmentationSupported='' VendorIdentifier='' VendorName=''
xmlns:bac='http://www.teletrol.com/BACnet'>
<bac:BACnetPoints>
<bac:baseAnalogInput EventState='0' InstanceNumber='3745'
ObjectName='Test_AI' ObjectType='0' OutOfService='0' PresentValue=''
StatusFlags='0' Units='95'>
<Description />
<BackwardReferences />
<GeneralProperties Attr='0' InstanceNumber='3745' IsConfigured='0'
ObjectName='Test_AI' ObjectType='0' SchemaVer='1.4' TraceOptions=''>
<Description />
</GeneralProperties>
<bac:ObjectIdentifier InstanceNumber='3745' ObjectType='0' />
</bac:baseAnalogInput>
<bac:baseAnalogOutput EventState='0' InstanceNumber='3746'
ObjectName='Test_AO' ObjectType='1' OutOfService='0' PresentValue=''
PriorityArray='' RelinquishDefault='' StatusFlags='0' Units='95'>
<Description />
<BackwardReferences />
<GeneralProperties Attr='0' InstanceNumber='3746' IsConfigured='0'
ObjectName='Test_AO' ObjectType='1' SchemaVer='1.4' TraceOptions=''>
<Description />
</GeneralProperties>
<bac:ObjectIdentifier InstanceNumber='3746' ObjectType='1' />
</bac:baseAnalogOutput>
</bac:BACnetPoints>
<GeneralProperties Attr='1' InstanceNumber='3744' IsConfigured='0'
ObjectName='Building_1' ObjectType='8' SchemaVer='1.4' TraceOptions='0'>
<Description />
</GeneralProperties>
<bac:ObjectIdentifier InstanceNumber='3744' ObjectType='8' />
</bac:BACnetDevice>

i need to insert another <bac:baseAnalogOutput></bac:baseAnalogOutput>
element into this xml document between <bac:BACnetPointsand
</bac:BACnetPointsi know how to do it with regular xml element but how does
it work with namespace perfix? i use VB.net with .Net DOM. any example is
much appericated.

thank you