File A

hosta,1.1.1.1,00000C123456,
hostb,2.2.2.2,00000C123457,
hostc,3.3.3.3,00000C123458,
hostd,4.4.4.4,00000C123459,
etc...(about 200 items, will have more later)


File 1
.
<HOST_NAME></HOST_NAME>
        <HOST_IP></HOST_IP>
        <HOST_MAC></HOST_MAC>
.
.

File 2
.
<HOST_NAME></HOST_NAME>
        <HOST_IP></HOST_IP>
        <HOST_MAC></HOST_MAC>
.
.
File 3
.
<HOST_NAME></HOST_NAME>
        <HOST_IP></HOST_IP>
        <HOST_MAC></HOST_MAC>
.
.


After all the docs are done, they will look like this...

File 1
.
<HOST_NAME>hosta</HOST_NAME>
        <HOST_IP>,1.1.1.1</HOST_IP>
        <HOST_MAC>00000C123456</HOST_MAC>
.
.
File 2
.
<HOST_NAME>hostb</HOST_NAME>
        <HOST_IP>,2.2.2.2</HOST_IP>
        <HOST_MAC>00000C123457</HOST_MAC>
.
.
etc.