how to group lines and span out

Question

For example, in this figure:

https://i.loli.net/2018/10/16/5bc57b28e0a2d.jpg

core.Txpool and core.blockchain spans out from the same line.  How to make that happen?

http://www.plantuml.com/plantuml/uml/SoWkIImgAStDuN8joKWjIYtDLT3IrLK8gGZ8pqSJSyh9JyvEpaZCpEDoICrB0Ue10000

Comments

Please try your example / problem in the plantuml webserver (http://www.plantuml.com/plantuml/uml) and add the resulting link to the question.

Answer 1

Not really an answer but "skinparam linetype ortho" does sometimes give much more clean looking diagrams