Ever wondered where you can find a couple Trantor planets and somewhere to sell the Industrial/Construction cargo you can buy there? Here's a perl script I cooked up that reads milky_way.xml and prints out
...
Sol/Hei_299: gg mol r r
Sol/Hermes: bd bsm mol
Sol/Hesiod: bd f fa gd gg i i i o o t v v
Sol/Hesione: bd bd f f i o r r
...
It's a quick hack, I didn't even use XML::Parser, just regexes.
Look at the comments in the script for some ideas on grepping the output to find systems with multiple planets of given types.
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"The gods confound the man who first found out how to distinguish the hours!
Confound him, too, who in this place set up a sundial, to cut and hack my day so wretchedly into small pieces!" -- Plautus, 200 BC