Hi,
topology=yes is a tag I've added to pipelines where the endpoints are known, but the route between is not.  I.e. here there is definitely a pipeline between the two end points of this way, but the kink in the middle may not exist but is rather an educated guess based on my knowledge of the pipeline industry.  (It is much more costly to put pipelines through forests than not, so usually forests are avoided, and otherwise the shortest route is taken. However, sometimes forests may have grown only AFTER the pipeline was laid, so sometimes they do go through forests. Also, sometimes forests are so big it is better to follow a track through the forest than to go around. etc.). In this case "topology=yes" flags up that the route (but not the endpoints) are a partially conjuecture.  In principle one could also add a "fix me" but in practice topology=yes is more specific and easier to search for.