{tags} on NMZ.result.*

I want to show the results in another way rather than the NMZ.result.* format. 
So I decided to edit these files. My problem is that the tags in there to 
display the search results are not documented so I dont' know if there's more 
than these:

${namazu::counter}
${uri}
${title}
${namazu::score}
${size}

I need one containing just the filename for example.

Any docs about this?
Thanks.
Nicolas Riesco