Need help to flatten and regroup data

Hi, 

Being new to XSLT and XPATH, I am having a very difficult time to
reformat the following XML data using XSLT1.0 and XPATH. Read through
FAQ and etc and didn't quite see exactly the same problem.
--
<Node>
	<name="systemA"/>
	<metric>
		<group type="Double" />
		<name="APP_CPU_TOTAL_TIME" />
		<ns:dataSample>
			<ns:data />
			<ns:time />
       		</ns:dataSample>
            	<ns:dataSample>
		 	..
            	</ns:dataSample>
		 	...
		</metric>
      	<metric>
      	 ..
		<metric />
   	
		<metric>
		<group type="Integer" />
		<name="APP_MEM_VIRT" />
		<ns:dataSample>
			<ns:data />
			<ns:time />
             	</ns:dataSample>
             	<ns:dataSample>
		 	..
             	</ns:dataSample>
		 	...
      	<metric/>
		<metric>
        	..

      	</metric>
		<metric>
		<group type="String" />
		<name='APP_NAME'>
		<ns:dataSample>
			<ns:data>
			<ns:time>
		</ns:dataSample> 
            <ns:dataSample>
		 ..
            </ns:dataSample>
		 ...
       </metric>
       ...

</Node>

<Node>
..
</Node>
---

to the following XML output

---
<Records>
	<NodeName> <!-- from node/name>
	<CpuTime> <!--- from ns:data when
metric/name="APP_CPU_TOTAL_TIME" for the same ns:time and node-->
	<MemUsed> <!---from ns:data when metric/name="APP_MEM_VIRT" for
the same ns:time and node--->
	<DataTime> <!---from ns:time -->
	<AppName> <!---from ns:data when metric/name="APP_NAME" for the
same ns:time and node--->
</Records>

--

I flatten the data but then I could not get anything else going. In
particular, I could not make XSLT to use template that tries to match
anything NOT in the "ns:" nodes. Examples, I could not get <template
match="//Node"> or  <template match="//metric">to work....

I declared the namespaces at the beginning of the style sheet.

I'd greatly appreciate any advice anybody can offer.

Thanks
Siew