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pf.conf syntax

Question regarding pf.conf syntax:

In the default pf.conf has a nat entry as follows:
nat on $ext_if from !($ext_if) -> ($ext_if:0)

The rule is self explanatory, but I don't understand the significance of the ":0". I grep'd all the docs, googled, and searched the documentation but I can't find any explanation of what the ":0" represents.

What does ":0" appended to the "$ext_if"  macro represent?


Scott A. Gerhardt, P.Geo.
Gerhardt Information Technologies