How to count records in a File

Hi All,
When I get a file in XI, I need to count the number of records that file has. Also each record has an amount field, I need to add all the amount fields in the all the records present. How do I go about doing it.
Regards,
XIer

Context will be the scope at which the operation (sum/count) will be performed.
suppose you have the following structure.
<source>
<record>
   <amount>20</amount>
   <amount>30</amount>
</record>
<record>
<record>
   <amount>10</amount>
   <amount>10</amount>
</record>
<source>
if you do the mapping the following way,
<record> --> count --> totalrecord
<amount> --> sum --> totalAmount
if the context of <record> is at same level - then you will get the total as 1. If you set the context at <source> then you will get the total as 2.
similarly for <amount>, the values will be 50 (2030) or 70 (20301010), if you set the context at record and source level.
To set the context, right click the <record> or <amount> node in the editor and goto the context menu.
Thanks

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