my($lat_key, $lon_key) = split(/./, $, 2);

The first argument to split is a regular expression in which the dot is a metacharacter and should be escaped. Note that since both lat and lon also contain a dot perhaps some other separator character would be a better choice if you want to split the keys. A comma would do and would not need to be escaped.

but I am getting error

You've chosen not to share the precise text of the error message. I cannot imagine why.

🦛

In reply to Re^7: Update XML Values using two primary keys by hippo
in thread Update XML Values using two primary keys by pratikpooja

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