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