Go to
http://fewmiles.tripod.com/oneworld/owenotes.html#1 and read lines 121 to 128. This is the Oneworld Explorer. There is also a trip called the Circle Pacific that has other rules. BA tends to lump a lot of different trips under the OWE name. In fact, I had one tell me about the new OWE with a mileage limit. He was referring of course to the global explorer.
You can go to
http://fewmiles.tripod.com/oneworld/...pacific.html#1 for the circle pacific rules, or to
http://fewmiles.tripod.com/oneworld/index.html#1 for a few others.